Merge pull request #86978 from kitbdev/multicaret-overhaul

Overhaul multicaret editing and selection in TextEdit

1 files changed, 4266 insertions, 770 deletions

diff --git a/tests/scene/test_text_edit.h b/tests/scene/test_text_edit.h
index 8577dd7148..246d869687 100644
--- a/tests/scene/test_text_edit.h
+++ b/tests/scene/test_text_edit.h
@@ -36,6 +36,23 @@
 #include "tests/test_macros.h"
 
 namespace TestTextEdit {
+static inline Array build_array() {
+	return Array();
+}
+template <typename... Targs>
+static inline Array build_array(Variant item, Targs... Fargs) {
+	Array a = build_array(Fargs...);
+	a.push_front(item);
+	return a;
+}
+static inline Array reverse_nested(Array array) {
+	Array reversed_array = array.duplicate(true);
+	reversed_array.reverse();
+	for (int i = 0; i < reversed_array.size(); i++) {
+		((Array)reversed_array[i]).reverse();
+	}
+	return reversed_array;
+}
 
 TEST_CASE("[SceneTree][TextEdit] text entry") {
 	SceneTree::get_singleton()->get_root()->set_physics_object_picking(false);
@@ -52,12 +69,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 		SIGNAL_WATCH(text_edit, "lines_edited_from");
 		SIGNAL_WATCH(text_edit, "caret_changed");
 
-		Array args1;
-		args1.push_back(0);
-		args1.push_back(0);
-		Array lines_edited_args;
-		lines_edited_args.push_back(args1);
-		lines_edited_args.push_back(args1.duplicate());
+		Array lines_edited_args = build_array(build_array(0, 0), build_array(0, 0));
 
 		SUBCASE("[TextEdit] clear and set text") {
 			// "text_changed" should not be emitted on clear / set.
@@ -119,13 +131,10 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_set");
 
-			// Clear.
+			// Can clear even if not editable.
 			text_edit->set_editable(false);
 
-			Array lines_edited_clear_args;
-			Array new_args = args1.duplicate();
-			new_args[0] = 1;
-			lines_edited_clear_args.push_back(new_args);
+			Array lines_edited_clear_args = build_array(build_array(1, 0));
 
 			text_edit->clear();
 			MessageQueue::get_singleton()->flush();
@@ -210,6 +219,321 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK_FALSE("text_changed");
 		}
 
+		SUBCASE("[TextEdit] insert text") {
+			// insert_text is 0 indexed.
+			ERR_PRINT_OFF;
+			text_edit->insert_text("test", 1, 0);
+			ERR_PRINT_ON;
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Insert text when there is no text.
+			lines_edited_args = build_array(build_array(0, 0));
+
+			text_edit->insert_text("tes", 0, 0);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "tes");
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 3);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Insert multiple lines.
+			lines_edited_args = build_array(build_array(0, 1));
+
+			text_edit->insert_text("t\ninserting text", 0, 3);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test\ninserting text");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 14);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Can insert even if not editable.
+			lines_edited_args = build_array(build_array(1, 1));
+
+			text_edit->set_editable(false);
+			text_edit->insert_text("mid", 1, 2);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test\ninmidserting text");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 17);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+			text_edit->set_editable(true);
+
+			// Undo insert.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test\ninserting text");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 14);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Redo insert.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test\ninmidserting text");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 17);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Insert offsets carets after the edit.
+			text_edit->add_caret(1, 1);
+			text_edit->add_caret(1, 4);
+			text_edit->select(1, 4, 1, 6, 2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 2));
+
+			text_edit->insert_text("\n ", 1, 2);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test\nin\n midserting text");
+			CHECK(text_edit->get_caret_count() == 3);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 2);
+			CHECK(text_edit->get_caret_column(0) == 16);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 1);
+			CHECK(text_edit->has_selection(2));
+			CHECK(text_edit->get_caret_line(2) == 2);
+			CHECK(text_edit->get_caret_column(2) == 5);
+			CHECK(text_edit->get_selection_origin_line(2) == 2);
+			CHECK(text_edit->get_selection_origin_column(2) == 3);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+			text_edit->remove_secondary_carets();
+			text_edit->deselect();
+
+			// Insert text outside of selections.
+			text_edit->set_text("test text");
+			text_edit->add_caret(0, 8);
+			text_edit->select(0, 1, 0, 4, 0);
+			text_edit->select(0, 4, 0, 8, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0));
+
+			text_edit->insert_text("a", 0, 4, true, false);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "testa text");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 1);
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 9);
+			CHECK(text_edit->get_selection_origin_line(1) == 0);
+			CHECK(text_edit->get_selection_origin_column(1) == 5);
+
+			// Insert text to beginning of selections.
+			text_edit->set_text("test text");
+			text_edit->add_caret(0, 8);
+			text_edit->select(0, 1, 0, 4, 0);
+			text_edit->select(0, 4, 0, 8, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0));
+
+			text_edit->insert_text("a", 0, 4, false, false);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "testa text");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 1);
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 9);
+			CHECK(text_edit->get_selection_origin_line(1) == 0);
+			CHECK(text_edit->get_selection_origin_column(1) == 4);
+
+			// Insert text to end of selections.
+			text_edit->set_text("test text");
+			text_edit->add_caret(0, 8);
+			text_edit->select(0, 1, 0, 4, 0);
+			text_edit->select(0, 4, 0, 8, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0));
+
+			text_edit->insert_text("a", 0, 4, true, true);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "testa text");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 5);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 1);
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 9);
+			CHECK(text_edit->get_selection_origin_line(1) == 0);
+			CHECK(text_edit->get_selection_origin_column(1) == 5);
+
+			// Insert text inside of selections.
+			text_edit->set_text("test text");
+			text_edit->add_caret(0, 8);
+			text_edit->select(0, 1, 0, 4, 0);
+			text_edit->select(0, 4, 0, 8, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0));
+
+			text_edit->insert_text("a", 0, 4, false, true);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "testa text");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 9);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 1);
+		}
+
+		SUBCASE("[TextEdit] remove text") {
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 2));
+
+			text_edit->set_text("test\nremoveing text\nthird line");
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_CHECK("text_set", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_changed");
+
+			// remove_text is 0 indexed.
+			ERR_PRINT_OFF;
+			text_edit->remove_text(3, 0, 3, 4);
+			ERR_PRINT_ON;
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test\nremoveing text\nthird line");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Remove multiple lines.
+			text_edit->set_caret_line(2);
+			text_edit->set_caret_column(10);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(2, 1));
+
+			text_edit->remove_text(1, 9, 2, 2);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test\nremoveingird line");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 17);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Can remove even if not editable.
+			lines_edited_args = build_array(build_array(1, 1));
+
+			text_edit->set_editable(false);
+			text_edit->remove_text(1, 5, 1, 6);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test\nremovingird line");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 16);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+			text_edit->set_editable(true);
+
+			// Undo remove.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test\nremoveingird line");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 17);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Redo remove.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test\nremovingird line");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 16);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Remove collapses carets and offsets carets after the edit.
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(9);
+			text_edit->add_caret(1, 10);
+			text_edit->select(1, 10, 1, 13, 1);
+			text_edit->add_caret(1, 14);
+			text_edit->add_caret(1, 2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+
+			text_edit->remove_text(1, 8, 1, 11);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test\nremoving line");
+			// Caret 0 was merged into the selection.
+			CHECK(text_edit->get_caret_count() == 3);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 10);
+			CHECK(text_edit->get_selection_origin_line(0) == 1);
+			CHECK(text_edit->get_selection_origin_column(0) == 8);
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 11);
+			CHECK(text_edit->get_caret_line(2) == 1);
+			CHECK(text_edit->get_caret_column(2) == 2);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+			text_edit->remove_secondary_carets();
+		}
+
 		SUBCASE("[TextEdit] set and get line") {
 			// Set / Get line is 0 indexed.
 			text_edit->set_line(1, "test");
@@ -225,6 +549,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_text() == "test");
 			CHECK(text_edit->get_line(0) == "test");
 			CHECK(text_edit->get_line(1) == "");
+			CHECK(text_edit->get_line_count() == 1);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_set");
@@ -233,14 +558,15 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			// Setting to a longer line, caret and selections should be preserved.
 			text_edit->select_all();
 			MessageQueue::get_singleton()->flush();
-			CHECK(text_edit->has_selection());
-			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_DISCARD("caret_changed");
 
 			text_edit->set_line(0, "test text");
 			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->get_line(0) == "test text");
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "test");
+			CHECK(text_edit->get_selection_origin_column() == 0);
+			CHECK(text_edit->get_caret_column() == 4);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("caret_changed");
@@ -299,12 +625,84 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("text_set");
-
 			ERR_PRINT_ON;
+
+			// Both ends of selection are adjusted and deselects.
+			text_edit->set_text("test text");
+			text_edit->select(0, 8, 0, 6);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("caret_changed");
+
+			text_edit->set_line(0, "test");
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_line(0) == "test");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_column() == 4);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Multiple carets adjust to keep visual position.
+			text_edit->set_text("test text");
+			text_edit->set_caret_column(2);
+			text_edit->add_caret(0, 0);
+			text_edit->add_caret(0, 1);
+			text_edit->add_caret(0, 6);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("caret_changed");
+
+			text_edit->set_line(0, "\tset line");
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_line(0) == "\tset line");
+			CHECK(text_edit->get_caret_count() == 3);
+			CHECK_FALSE(text_edit->has_selection());
+			// In the default font, these are the same positions.
+			CHECK(text_edit->get_caret_column(0) == 1);
+			CHECK(text_edit->get_caret_column(1) == 0);
+			// The previous caret at index 2 was merged.
+			CHECK(text_edit->get_caret_column(2) == 4);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+			text_edit->remove_secondary_carets();
+
+			// Insert multiple lines.
+			text_edit->set_text("test text\nsecond line");
+			text_edit->set_caret_column(5);
+			text_edit->add_caret(1, 6);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 1));
+
+			text_edit->set_line(0, "multiple\nlines");
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "multiple\nlines\nsecond line");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 3); // In the default font, this is the same position.
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 6);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+			text_edit->remove_secondary_carets();
 		}
 
 		SUBCASE("[TextEdit] swap lines") {
-			((Array)lines_edited_args[1])[1] = 1;
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 1));
 
 			text_edit->set_text("testing\nswap");
 			MessageQueue::get_singleton()->flush();
@@ -317,15 +715,10 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			text_edit->set_caret_column(text_edit->get_line(0).length());
 			MessageQueue::get_singleton()->flush();
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			// Emitted twice for each line.
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 0), build_array(1, 1), build_array(1, 1));
 
-			((Array)lines_edited_args[1])[1] = 0;
-			Array swap_args;
-			swap_args.push_back(1);
-			swap_args.push_back(1);
-			lines_edited_args.push_back(swap_args);
-			lines_edited_args.push_back(swap_args);
-
-			// Order does not matter. Should also work if not editable.
+			// Order does not matter. Works when not editable.
 			text_edit->set_editable(false);
 			text_edit->swap_lines(1, 0);
 			MessageQueue::get_singleton()->flush();
@@ -336,19 +729,15 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK_FALSE("text_set");
 			text_edit->set_editable(true);
 
-			lines_edited_args.reverse();
-
-			// Single undo/redo action
+			// Single undo/redo action.
 			text_edit->undo();
 			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->get_text() == "testing\nswap");
-			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_set");
 
-			lines_edited_args.reverse();
-
 			text_edit->redo();
 			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->get_text() == "swap\ntesting");
@@ -361,36 +750,70 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			ERR_PRINT_OFF;
 			text_edit->swap_lines(-1, 0);
 			CHECK(text_edit->get_text() == "swap\ntesting");
-			SIGNAL_CHECK_FALSE("lines_edited_from");
-			SIGNAL_CHECK_FALSE("caret_changed");
-			SIGNAL_CHECK_FALSE("text_changed");
-			SIGNAL_CHECK_FALSE("text_set");
-
 			text_edit->swap_lines(0, -1);
 			CHECK(text_edit->get_text() == "swap\ntesting");
-			SIGNAL_CHECK_FALSE("lines_edited_from");
-			SIGNAL_CHECK_FALSE("caret_changed");
-			SIGNAL_CHECK_FALSE("text_changed");
-			SIGNAL_CHECK_FALSE("text_set");
-
 			text_edit->swap_lines(2, 0);
 			CHECK(text_edit->get_text() == "swap\ntesting");
+			text_edit->swap_lines(0, 2);
+			CHECK(text_edit->get_text() == "swap\ntesting");
+			MessageQueue::get_singleton()->flush();
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("text_set");
+			ERR_PRINT_ON;
+
+			// Carets are also swapped.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(2);
+			text_edit->select(0, 0, 0, 2);
+			text_edit->add_caret(1, 6);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 1), build_array(1, 1), build_array(0, 0), build_array(0, 0));
+
+			text_edit->swap_lines(0, 1);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "testing\nswap");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 2);
+			CHECK(text_edit->get_selection_origin_line(0) == 1);
+			CHECK(text_edit->get_selection_origin_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 6);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+			text_edit->remove_secondary_carets();
+
+			// Swap non adjacent lines.
+			text_edit->insert_line_at(1, "new line");
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(5);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "testing\nnew line\nswap");
+			SIGNAL_DISCARD("caret_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("text_changed");
+			lines_edited_args = build_array(build_array(2, 2), build_array(2, 2), build_array(0, 0), build_array(0, 0));
 
 			text_edit->swap_lines(0, 2);
-			CHECK(text_edit->get_text() == "swap\ntesting");
-			SIGNAL_CHECK_FALSE("lines_edited_from");
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "swap\nnew line\ntesting");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 5);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 			SIGNAL_CHECK_FALSE("caret_changed");
-			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_set");
-			ERR_PRINT_ON;
 		}
 
 		SUBCASE("[TextEdit] insert line at") {
-			((Array)lines_edited_args[1])[1] = 1;
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 1));
 
 			text_edit->set_text("testing\nswap");
 			MessageQueue::get_singleton()->flush();
@@ -407,9 +830,9 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_selection_to_line() == 1);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 
-			// Insert before should move caret and selection, and works when not editable.
+			// Insert line at inserts a line before and moves caret and selection. Works when not editable.
 			text_edit->set_editable(false);
-			lines_edited_args.remove_at(0);
+			lines_edited_args = build_array(build_array(0, 1));
 			text_edit->insert_line_at(0, "new");
 			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->get_text() == "new\ntesting\nswap");
@@ -417,7 +840,9 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_caret_column() == text_edit->get_line(2).size() - 1);
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selection_from_line() == 1);
+			CHECK(text_edit->get_selection_from_column() == 0);
 			CHECK(text_edit->get_selection_to_line() == 2);
+			CHECK(text_edit->get_selection_to_column() == 4);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
@@ -425,19 +850,15 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			text_edit->set_editable(true);
 
 			// Can undo/redo as single action.
-			((Array)lines_edited_args[0])[0] = 1;
-			((Array)lines_edited_args[0])[1] = 0;
 			text_edit->undo();
 			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->get_text() == "testing\nswap");
 			CHECK(text_edit->has_selection());
-			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_set");
 
-			((Array)lines_edited_args[0])[0] = 0;
-			((Array)lines_edited_args[0])[1] = 1;
 			text_edit->redo();
 			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->get_text() == "new\ntesting\nswap");
@@ -454,9 +875,8 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_selection_from_line() == 0);
 			CHECK(text_edit->get_selection_to_line() == 2);
 			SIGNAL_CHECK_FALSE("caret_changed");
+			lines_edited_args = build_array(build_array(2, 3));
 
-			((Array)lines_edited_args[0])[0] = 2;
-			((Array)lines_edited_args[0])[1] = 3;
 			text_edit->insert_line_at(2, "after");
 			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->get_text() == "new\ntesting\nafter\nswap");
@@ -474,24 +894,222 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			ERR_PRINT_OFF;
 			text_edit->insert_line_at(-1, "after");
 			CHECK(text_edit->get_text() == "new\ntesting\nafter\nswap");
+			text_edit->insert_line_at(4, "after");
+			CHECK(text_edit->get_text() == "new\ntesting\nafter\nswap");
+			MessageQueue::get_singleton()->flush();
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("text_set");
+			ERR_PRINT_ON;
 
-			text_edit->insert_line_at(4, "after");
-			CHECK(text_edit->get_text() == "new\ntesting\nafter\nswap");
+			// Can insert multiple lines.
+			text_edit->select(0, 1, 2, 2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(2, 4));
+
+			text_edit->insert_line_at(2, "multiple\nlines");
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "new\ntesting\nmultiple\nlines\nafter\nswap");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 4);
+			CHECK(text_edit->get_caret_column() == 2);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 1);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+		}
+
+		SUBCASE("[TextEdit] remove line at") {
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 5));
+			text_edit->set_text("testing\nremove line at\n\tremove\nlines\n\ntest");
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "testing\nremove line at\n\tremove\nlines\n\ntest");
+			SIGNAL_CHECK("text_set", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_changed");
+
+			// Remove line handles multiple carets.
+			text_edit->set_caret_line(2);
+			text_edit->set_caret_column(0);
+			text_edit->add_caret(2, 7);
+			text_edit->select(2, 1, 2, 7, 1);
+			text_edit->add_caret(3, 1);
+			text_edit->add_caret(4, 5);
+			text_edit->add_caret(1, 5);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(3, 2));
+
+			text_edit->remove_line_at(2, true);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "testing\nremove line at\nlines\n\ntest");
+			CHECK(text_edit->get_caret_count() == 5);
+			CHECK_FALSE(text_edit->has_selection(0)); // Same line.
+			CHECK(text_edit->get_caret_line(0) == 2);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK(text_edit->has_selection(1)); // Same line, clamped.
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 5);
+			CHECK(text_edit->get_selection_origin_line(1) == 2);
+			CHECK(text_edit->get_selection_origin_column(1) == 3); // In the default font, this is the same position.
+			CHECK_FALSE(text_edit->has_selection(2)); // Moved up.
+			CHECK(text_edit->get_caret_line(2) == 2);
+			CHECK(text_edit->get_caret_column(2) == 1);
+			CHECK_FALSE(text_edit->has_selection(3)); // Moved up.
+			CHECK(text_edit->get_caret_line(3) == 3);
+			CHECK(text_edit->get_caret_column(3) == 0);
+			CHECK_FALSE(text_edit->has_selection(4)); // Didn't move.
+			CHECK(text_edit->get_caret_line(4) == 1);
+			CHECK(text_edit->get_caret_column(4) == 5);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+			text_edit->remove_secondary_carets();
+
+			// Remove first line.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(5);
+			text_edit->add_caret(4, 4);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 0));
+
+			text_edit->remove_line_at(0, false);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "remove line at\nlines\n\ntest");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK(text_edit->get_caret_line(1) == 3);
+			CHECK(text_edit->get_caret_column(1) == 4);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+			text_edit->remove_secondary_carets();
+
+			// Remove empty line.
+			text_edit->set_caret_line(2);
+			text_edit->set_caret_column(0);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(3, 2));
+
+			text_edit->remove_line_at(2, false);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "remove line at\nlines\ntest");
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Remove last line.
+			text_edit->set_caret_line(2);
+			text_edit->set_caret_column(2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(2, 1));
+
+			text_edit->remove_line_at(2, true);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "remove line at\nlines");
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 5);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Out of bounds.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			ERR_PRINT_OFF
+			text_edit->remove_line_at(2, true);
+			ERR_PRINT_ON
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "remove line at\nlines");
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 2);
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("text_set");
-			ERR_PRINT_ON;
+
+			// Remove regular line with move caret up and not editable.
+			text_edit->set_editable(false);
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 0));
+
+			text_edit->remove_line_at(1, false);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "remove line at");
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 1); // In the default font, this is the same position.
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+			text_edit->set_editable(true);
+
+			// Undo.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "remove line at\nlines");
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 2);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Redo.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "remove line at");
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 1);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
+
+			// Remove only line removes line content.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(10);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0));
+
+			text_edit->remove_line_at(0);
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "");
+			CHECK(text_edit->get_line_count() == 1);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_set");
 		}
 
-		SUBCASE("[TextEdit] insert line at caret") {
-			lines_edited_args.pop_back();
-			((Array)lines_edited_args[0])[1] = 1;
+		SUBCASE("[TextEdit] insert text at caret") {
+			lines_edited_args = build_array(build_array(0, 1));
 
+			// Insert text at caret can insert multiple lines.
 			text_edit->insert_text_at_caret("testing\nswap");
 			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->get_text() == "testing\nswap");
@@ -502,11 +1120,13 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_set");
 
+			// Text is inserted at caret.
 			text_edit->set_caret_line(0, false);
 			text_edit->set_caret_column(2);
+			MessageQueue::get_singleton()->flush();
 			SIGNAL_DISCARD("caret_changed");
 
-			((Array)lines_edited_args[0])[1] = 0;
+			lines_edited_args = build_array(build_array(0, 0));
 			text_edit->insert_text_at_caret("mid");
 			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->get_text() == "temidsting\nswap");
@@ -517,9 +1137,10 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_set");
 
+			// Selections are deleted then text is inserted. It also works even if not editable.
 			text_edit->select(0, 0, 0, text_edit->get_line(0).length());
 			CHECK(text_edit->has_selection());
-			lines_edited_args.push_back(args1.duplicate());
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 0));
 
 			text_edit->set_editable(false);
 			text_edit->insert_text_at_caret("new line");
@@ -534,12 +1155,15 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK_FALSE("text_set");
 			text_edit->set_editable(true);
 
+			// Undo restores text and selection.
 			text_edit->undo();
 			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->get_text() == "temidsting\nswap");
 			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 5);
+			CHECK(text_edit->get_caret_column() == text_edit->get_line(0).length());
 			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 0);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
@@ -589,24 +1213,19 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 		SIGNAL_WATCH(text_edit, "lines_edited_from");
 		SIGNAL_WATCH(text_edit, "caret_changed");
 
-		Array args1;
-		args1.push_back(0);
-		args1.push_back(0);
-		Array lines_edited_args;
-		lines_edited_args.push_back(args1);
-		lines_edited_args.push_back(args1.duplicate());
+		Array lines_edited_args = build_array(build_array(0, 0), build_array(0, 0));
 
 		SUBCASE("[TextEdit] select all") {
+			// Select when there is no text does not select.
 			text_edit->select_all();
 			CHECK_FALSE(text_edit->has_selection());
-			ERR_PRINT_OFF;
-			CHECK(text_edit->get_selection_from_line() == -1);
-			CHECK(text_edit->get_selection_from_column() == -1);
-			CHECK(text_edit->get_selection_to_line() == -1);
-			CHECK(text_edit->get_selection_to_column() == -1);
+			CHECK(text_edit->get_selection_from_line() == 0);
+			CHECK(text_edit->get_selection_from_column() == 0);
+			CHECK(text_edit->get_selection_to_line() == 0);
+			CHECK(text_edit->get_selection_to_column() == 0);
 			CHECK(text_edit->get_selected_text() == "");
-			ERR_PRINT_ON;
 
+			// Select all selects all text.
 			text_edit->set_text("test\nselection");
 			SEND_GUI_ACTION("ui_text_select_all");
 			CHECK(text_edit->get_viewport()->is_input_handled());
@@ -618,10 +1237,12 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_selection_to_line() == 1);
 			CHECK(text_edit->get_selection_to_column() == 9);
 			CHECK(text_edit->get_selection_mode() == TextEdit::SelectionMode::SELECTION_MODE_SHIFT);
+			CHECK(text_edit->is_caret_after_selection_origin());
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 9);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 
+			// Cannot select when disabled.
 			text_edit->set_caret_line(0);
 			text_edit->set_caret_column(0);
 			text_edit->set_selecting_enabled(false);
@@ -654,6 +1275,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
+			// Select word under caret with multiple carets.
 			text_edit->select_word_under_caret();
 			CHECK(text_edit->has_selection(0));
 			CHECK(text_edit->get_selected_text(0) == "test");
@@ -675,6 +1297,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 
 			CHECK(text_edit->get_caret_count() == 2);
 
+			// Select word under caret disables selection if there is already a selection.
 			text_edit->select_word_under_caret();
 			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "");
@@ -703,6 +1326,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_selected_text() == "test\ntest");
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 
+			// Cannot select when disabled.
 			text_edit->set_selecting_enabled(false);
 			text_edit->select_word_under_caret();
 			CHECK_FALSE(text_edit->has_selection());
@@ -714,10 +1338,10 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK_FALSE("caret_changed");
 			text_edit->set_selecting_enabled(true);
 
-			text_edit->set_caret_line(1, false, true, 0, 0);
+			// Select word under caret when there is no word does not select.
+			text_edit->set_caret_line(1, false, true, -1, 0);
 			text_edit->set_caret_column(5, false, 0);
-
-			text_edit->set_caret_line(2, false, true, 0, 1);
+			text_edit->set_caret_line(2, false, true, -1, 1);
 			text_edit->set_caret_column(5, false, 1);
 
 			text_edit->select_word_under_caret();
@@ -739,7 +1363,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			text_edit->set_caret_column(0);
 			text_edit->set_caret_line(1);
 
-			// First selection made by the implicit select_word_under_caret call
+			// First selection made by the implicit select_word_under_caret call.
 			text_edit->add_selection_for_next_occurrence();
 			CHECK(text_edit->get_caret_count() == 1);
 			CHECK(text_edit->get_selected_text(0) == "test");
@@ -780,7 +1404,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_caret_line(3) == 3);
 			CHECK(text_edit->get_caret_column(3) == 9);
 
-			// A different word with a new manually added caret
+			// A different word with a new manually added caret.
 			text_edit->add_caret(2, 1);
 			text_edit->select(2, 0, 2, 4, 4);
 			CHECK(text_edit->get_selected_text(4) == "rand");
@@ -795,7 +1419,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_caret_line(5) == 3);
 			CHECK(text_edit->get_caret_column(5) == 22);
 
-			// Make sure the previous selections are still active
+			// Make sure the previous selections are still active.
 			CHECK(text_edit->get_selected_text(0) == "test");
 			CHECK(text_edit->get_selected_text(1) == "test");
 			CHECK(text_edit->get_selected_text(2) == "test");
@@ -987,6 +1611,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::SHIFT)
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "t");
+			CHECK(text_edit->is_caret_after_selection_origin());
 
 #ifdef MACOS_ENABLED
 			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::SHIFT | KeyModifierMask::ALT)
@@ -995,10 +1620,12 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 #endif
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "test");
+			CHECK(text_edit->is_caret_after_selection_origin());
 
 			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT)
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "tes");
+			CHECK(text_edit->is_caret_after_selection_origin());
 
 #ifdef MACOS_ENABLED
 			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT | KeyModifierMask::ALT)
@@ -1019,11 +1646,13 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT)
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "t");
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin());
 
 			SEND_GUI_KEY_EVENT(Key::LEFT)
 			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "");
 
+			// Cannot select when disabled.
 			text_edit->set_selecting_enabled(false);
 			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::SHIFT)
 			CHECK_FALSE(text_edit->has_selection());
@@ -1032,46 +1661,120 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 		}
 
 		SUBCASE("[TextEdit] mouse drag select") {
-			/* Set size for mouse input. */
+			// Set size for mouse input.
 			text_edit->set_size(Size2(200, 200));
 
 			text_edit->set_text("this is some text\nfor selection");
 			text_edit->grab_focus();
 			MessageQueue::get_singleton()->flush();
 
-			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_pos_at_line_column(0, 1), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
-			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_pos_at_line_column(0, 7), MouseButtonMask::LEFT, Key::NONE);
+			// Click and drag to make a selection.
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 0).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			// Add (2,0) to bring it past the center point of the grapheme and account for integer division flooring.
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 5).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "for s");
 			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_POINTER);
-			CHECK(text_edit->get_selection_from_line() == 1);
-			CHECK(text_edit->get_selection_from_column() == 0);
-			CHECK(text_edit->get_selection_to_line() == 1);
-			CHECK(text_edit->get_selection_to_column() == 5);
+			CHECK(text_edit->get_selection_origin_line() == 1);
+			CHECK(text_edit->get_selection_origin_column() == 0);
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 5);
+			CHECK(text_edit->is_caret_after_selection_origin());
+			CHECK(text_edit->is_dragging_cursor());
 
-			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_pos_at_line_column(0, 9), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			// Releasing finishes.
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(1, 5).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "for s");
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 9).get_center() + Point2i(2, 0), MouseButtonMask::NONE, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "for s");
+			CHECK(text_edit->get_selection_origin_line() == 1);
+			CHECK(text_edit->get_selection_origin_column() == 0);
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 5);
+			CHECK(text_edit->is_caret_after_selection_origin());
+
+			// Clicking clears selection.
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 7).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
 			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 7);
 
+			// Cannot select when disabled, but caret still moves.
 			text_edit->set_selecting_enabled(false);
-			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_pos_at_line_column(0, 1), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
-			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_pos_at_line_column(0, 7), MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 0).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 0);
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 5).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
 			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 5);
 			text_edit->set_selecting_enabled(true);
+
+			// Only last caret is moved when adding a selection.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(4);
+			text_edit->add_caret(0, 15);
+			text_edit->select(0, 11, 0, 15, 1);
+			MessageQueue::get_singleton()->flush();
+
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 5).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE | KeyModifierMask::ALT);
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 0).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_caret_count() == 3);
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_POINTER);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_selection_origin_line(1) == 0);
+			CHECK(text_edit->get_selection_origin_column(1) == 11);
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 15);
+
+			CHECK(text_edit->has_selection(2));
+			CHECK(text_edit->get_selected_text(2) == "for s");
+			CHECK(text_edit->get_selection_origin_line(2) == 1);
+			CHECK(text_edit->get_selection_origin_column(2) == 5);
+			CHECK(text_edit->get_caret_line(2) == 1);
+			CHECK(text_edit->get_caret_column(2) == 0);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(2));
+
+			// Overlapping carets and selections merges them.
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 3).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "s is some text\nfor s");
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_POINTER);
+			CHECK(text_edit->get_selection_origin_line() == 1);
+			CHECK(text_edit->get_selection_origin_column() == 5);
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 3);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin());
+
+			// Entering text stops selecting.
+			text_edit->insert_text_at_caret("a");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_text() == "thiaelection");
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 4);
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 10).get_center() + Point2i(2, 0), MouseButtonMask::NONE, Key::NONE);
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 4);
 		}
 
 		SUBCASE("[TextEdit] mouse word select") {
-			/* Set size for mouse input. */
+			// Set size for mouse input.
 			text_edit->set_size(Size2(200, 200));
 
-			text_edit->set_text("this is some text\nfor selection");
+			text_edit->set_text("this is some text\nfor selection\n");
 			MessageQueue::get_singleton()->flush();
 			SIGNAL_DISCARD("caret_changed");
 
-			SEND_GUI_DOUBLE_CLICK(text_edit->get_pos_at_line_column(0, 2), Key::NONE);
+			// Double click to select word.
+			SEND_GUI_DOUBLE_CLICK(text_edit->get_rect_at_line_column(1, 2).get_center() + Point2i(2, 0), Key::NONE);
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "for");
 			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_WORD);
@@ -1081,9 +1784,11 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_selection_to_column() == 3);
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 3);
+			CHECK(text_edit->is_caret_after_selection_origin());
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 
-			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_pos_at_line_column(0, 7), MouseButtonMask::LEFT, Key::NONE);
+			// Moving mouse selects entire words at a time.
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 6).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "for selection");
 			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_WORD);
@@ -1093,15 +1798,116 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_selection_to_column() == 13);
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 13);
+			CHECK(text_edit->is_caret_after_selection_origin());
+			CHECK(text_edit->is_dragging_cursor());
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+
+			// Moving to a word before the initial selected word reverses selection direction and keeps the initial word selected.
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 10).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "some text\nfor");
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_WORD);
+			CHECK(text_edit->get_selection_from_line() == 0);
+			CHECK(text_edit->get_selection_from_column() == 8);
+			CHECK(text_edit->get_selection_to_line() == 1);
+			CHECK(text_edit->get_selection_to_column() == 3);
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 8);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin());
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 
-			Point2i line_0 = text_edit->get_pos_at_line_column(0, 0);
-			line_0.y /= 2;
-			SEND_GUI_MOUSE_BUTTON_EVENT(line_0, MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			// Releasing finishes.
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(0, 10).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "some text\nfor");
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 2).get_center(), MouseButtonMask::NONE, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "some text\nfor");
+			text_edit->deselect();
+
+			// Can start word select mode on an empty line.
+			SEND_GUI_DOUBLE_CLICK(text_edit->get_rect_at_line_column(2, 0).get_center() + Point2i(2, 0), Key::NONE);
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_WORD);
+			CHECK(text_edit->get_caret_line() == 2);
+			CHECK(text_edit->get_caret_column() == 0);
+
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 9).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "selection\n");
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_WORD);
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 4);
+			CHECK(text_edit->get_selection_origin_line() == 2);
+			CHECK(text_edit->get_selection_origin_column() == 0);
+
+			// Clicking clears selection.
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 0).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 0);
+
+			// Can start word select mode when not on a word.
+			SEND_GUI_DOUBLE_CLICK(text_edit->get_rect_at_line_column(0, 12).get_center() + Point2i(2, 0), Key::NONE);
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_WORD);
 			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 12);
+
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 9).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_WORD);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == " text\nfor selection");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 13);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 12);
+
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 10).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_WORD);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "some");
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 8);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 12);
+
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(0, 15).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+
+			// Add a new selection without affecting the old one.
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 5).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE | KeyModifierMask::ALT);
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 8).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE | KeyModifierMask::ALT);
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_POINTER);
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "some");
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 8);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 12);
 
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_selected_text(1) == "ele");
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 8);
+			CHECK(text_edit->get_selection_origin_line(1) == 1);
+			CHECK(text_edit->get_selection_origin_column(1) == 5);
+
+			// Shift + double click to extend selection and start word select mode.
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(1, 8).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			text_edit->remove_secondary_carets();
+			SEND_GUI_DOUBLE_CLICK(text_edit->get_rect_at_line_column(1, 7).get_center() + Point2i(2, 0), Key::NONE | KeyModifierMask::SHIFT);
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_WORD);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == " text\nfor selection");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 13);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 12);
+
+			// Cannot select when disabled, but caret still moves to end of word.
 			text_edit->set_selecting_enabled(false);
-			SEND_GUI_DOUBLE_CLICK(text_edit->get_pos_at_line_column(0, 2), Key::NONE);
+			SEND_GUI_DOUBLE_CLICK(text_edit->get_rect_at_line_column(1, 1).get_center() + Point2i(2, 0), Key::NONE);
 			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 3);
@@ -1109,32 +1915,149 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 		}
 
 		SUBCASE("[TextEdit] mouse line select") {
-			/* Set size for mouse input. */
+			// Set size for mouse input.
 			text_edit->set_size(Size2(200, 200));
 
-			text_edit->set_text("this is some text\nfor selection");
+			text_edit->set_text("this is some text\nfor selection\nwith 3 lines");
 			MessageQueue::get_singleton()->flush();
 
-			SEND_GUI_DOUBLE_CLICK(text_edit->get_pos_at_line_column(0, 2), Key::NONE);
-			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_pos_at_line_column(0, 2), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			// Triple click to select line.
+			SEND_GUI_DOUBLE_CLICK(text_edit->get_rect_at_line_column(1, 2).get_center(), Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 2).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
 			CHECK(text_edit->has_selection());
-			CHECK(text_edit->get_selected_text() == "for selection");
+			CHECK(text_edit->get_selected_text() == "for selection\n");
 			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_LINE);
 			CHECK(text_edit->get_selection_from_line() == 1);
 			CHECK(text_edit->get_selection_from_column() == 0);
+			CHECK(text_edit->get_selection_to_line() == 2);
+			CHECK(text_edit->get_selection_to_column() == 0);
+			CHECK(text_edit->get_caret_line() == 2);
+			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->is_caret_after_selection_origin());
+
+			// Moving mouse selects entire lines at a time. Selecting above reverses the selection direction.
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 10).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "this is some text\nfor selection");
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_LINE);
+			CHECK(text_edit->get_selection_from_line() == 0);
+			CHECK(text_edit->get_selection_from_column() == 0);
 			CHECK(text_edit->get_selection_to_line() == 1);
 			CHECK(text_edit->get_selection_to_column() == 13);
-			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 0);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin());
+			CHECK(text_edit->is_dragging_cursor());
 
-			Point2i line_0 = text_edit->get_pos_at_line_column(0, 0);
-			line_0.y /= 2;
-			SEND_GUI_MOUSE_BUTTON_EVENT(line_0, MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			// Selecting to the last line puts the caret at end of the line.
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(2, 10).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "for selection\nwith 3 lines");
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_LINE);
+			CHECK(text_edit->get_selection_from_line() == 1);
+			CHECK(text_edit->get_selection_from_column() == 0);
+			CHECK(text_edit->get_selection_to_line() == 2);
+			CHECK(text_edit->get_selection_to_column() == 12);
+			CHECK(text_edit->get_caret_line() == 2);
+			CHECK(text_edit->get_caret_column() == 12);
+			CHECK(text_edit->is_caret_after_selection_origin());
+
+			// Releasing finishes.
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(2, 10).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "for selection\nwith 3 lines");
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 2).get_center(), MouseButtonMask::NONE, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "for selection\nwith 3 lines");
+
+			// Clicking clears selection.
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 0).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
 			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 0);
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(0, 0).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+
+			// Can start line select mode on an empty line.
+			text_edit->set_text("this is some text\n\nfor selection\nwith 4 lines");
+			MessageQueue::get_singleton()->flush();
+			SEND_GUI_DOUBLE_CLICK(text_edit->get_rect_at_line_column(1, 0).get_center() + Point2i(2, 0), Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 0).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "\n");
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_LINE);
+			CHECK(text_edit->get_caret_line() == 2);
+			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_selection_origin_line() == 1);
+			CHECK(text_edit->get_selection_origin_column() == 0);
+
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(2, 9).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "\nfor selection\n");
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_LINE);
+			CHECK(text_edit->get_caret_line() == 3);
+			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_selection_origin_line() == 1);
+			CHECK(text_edit->get_selection_origin_column() == 0);
+
+			// Add a new selection without affecting the old one.
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 3).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE | KeyModifierMask::ALT);
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 4).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE | KeyModifierMask::ALT);
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_POINTER);
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "\nfor selection\n");
+			CHECK(text_edit->get_caret_line(0) == 3);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK(text_edit->get_selection_origin_line(0) == 1);
+			CHECK(text_edit->get_selection_origin_column(0) == 0);
+
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_selected_text(1) == "is");
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 4);
+			CHECK(text_edit->get_selection_origin_line(1) == 0);
+			CHECK(text_edit->get_selection_origin_column(1) == 2);
+			text_edit->remove_secondary_carets();
+			text_edit->deselect();
+
+			// Selecting the last line puts caret at the end.
+			SEND_GUI_DOUBLE_CLICK(text_edit->get_rect_at_line_column(3, 3).get_center(), Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(3, 3).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_LINE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "with 4 lines");
+			CHECK(text_edit->get_caret_line() == 3);
+			CHECK(text_edit->get_caret_column() == 12);
+			CHECK(text_edit->get_selection_origin_line() == 3);
+			CHECK(text_edit->get_selection_origin_column() == 0);
+
+			// Selecting above reverses direction.
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(2, 10).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_LINE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "for selection\nwith 4 lines");
+			CHECK(text_edit->get_caret_line() == 2);
+			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_selection_origin_line() == 3);
+			CHECK(text_edit->get_selection_origin_column() == 12);
+
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(2, 10).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
 
+			// Shift + triple click to extend selection and restart line select mode.
+			SEND_GUI_DOUBLE_CLICK(text_edit->get_rect_at_line_column(0, 9).get_center() + Point2i(2, 0), Key::NONE | KeyModifierMask::SHIFT);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 9).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE | KeyModifierMask::SHIFT);
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_LINE);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "this is some text\n\nfor selection\nwith 4 lines");
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_selection_origin_line() == 3);
+			CHECK(text_edit->get_selection_origin_column() == 12);
+
+			// Cannot select when disabled, but caret still moves to the start of the next line.
 			text_edit->set_selecting_enabled(false);
-			SEND_GUI_DOUBLE_CLICK(text_edit->get_pos_at_line_column(0, 2), Key::NONE);
-			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_pos_at_line_column(0, 2), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_DOUBLE_CLICK(text_edit->get_rect_at_line_column(0, 2).get_center(), Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 2).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
 			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 0);
@@ -1142,30 +2065,47 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 		}
 
 		SUBCASE("[TextEdit] mouse shift click select") {
-			/* Set size for mouse input. */
+			// Set size for mouse input.
 			text_edit->set_size(Size2(200, 200));
 
 			text_edit->set_text("this is some text\nfor selection");
 			MessageQueue::get_singleton()->flush();
 
-			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_pos_at_line_column(0, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
-			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_pos_at_line_column(0, 7), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE | KeyModifierMask::SHIFT);
+			// Shift click to make a selection from the previous caret position.
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 1).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 5).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE | KeyModifierMask::SHIFT);
 			CHECK(text_edit->has_selection());
-			CHECK(text_edit->get_selected_text() == "for s");
+			CHECK(text_edit->get_selected_text() == "or s");
 			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_POINTER);
-			CHECK(text_edit->get_selection_from_line() == 1);
-			CHECK(text_edit->get_selection_from_column() == 0);
-			CHECK(text_edit->get_selection_to_line() == 1);
-			CHECK(text_edit->get_selection_to_column() == 5);
+			CHECK(text_edit->get_selection_origin_line() == 1);
+			CHECK(text_edit->get_selection_origin_column() == 1);
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 5);
+			CHECK(text_edit->is_caret_after_selection_origin());
 
-			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_pos_at_line_column(0, 9), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			// Shift click above to switch selection direction. Uses original selection position.
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 6).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE | KeyModifierMask::SHIFT);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "s some text\nf");
+			CHECK(text_edit->get_selection_mode() == TextEdit::SELECTION_MODE_POINTER);
+			CHECK(text_edit->get_selection_origin_line() == 1);
+			CHECK(text_edit->get_selection_origin_column() == 1);
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 6);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin());
+
+			// Clicking clears selection.
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 7).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
 			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 7);
 
+			// Cannot select when disabled, but caret still moves.
 			text_edit->set_selecting_enabled(false);
-			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_pos_at_line_column(0, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
-			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_pos_at_line_column(0, 7), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE | KeyModifierMask::SHIFT);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 0).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 0);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 5).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE | KeyModifierMask::SHIFT);
 			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 5);
@@ -1175,89 +2115,166 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 		SUBCASE("[TextEdit] select and deselect") {
 			text_edit->set_text("this is some text\nfor selection");
 			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
 
+			// Select clamps input to full text.
 			text_edit->select(-1, -1, 500, 500);
+			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "this is some text\nfor selection");
+			CHECK(text_edit->is_caret_after_selection_origin(0));
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 0);
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 13);
+			CHECK(text_edit->get_selection_from_line(0) == text_edit->get_selection_origin_line(0));
+			CHECK(text_edit->get_selection_from_column(0) == text_edit->get_selection_origin_column(0));
+			CHECK(text_edit->get_selection_to_line(0) == text_edit->get_caret_line(0));
+			CHECK(text_edit->get_selection_to_column(0) == text_edit->get_caret_column(0));
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
 
 			text_edit->deselect();
+			MessageQueue::get_singleton()->flush();
 			CHECK_FALSE(text_edit->has_selection());
+			SIGNAL_CHECK_FALSE("caret_changed");
 
+			// Select works in the other direction.
 			text_edit->select(500, 500, -1, -1);
+			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == "this is some text\nfor selection");
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(0));
+			CHECK(text_edit->get_selection_origin_line(0) == 1);
+			CHECK(text_edit->get_selection_origin_column(0) == 13);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK(text_edit->get_selection_from_line(0) == text_edit->get_caret_line(0));
+			CHECK(text_edit->get_selection_from_column(0) == text_edit->get_caret_column(0));
+			CHECK(text_edit->get_selection_to_line(0) == text_edit->get_selection_origin_line(0));
+			CHECK(text_edit->get_selection_to_column(0) == text_edit->get_selection_origin_column(0));
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
 
 			text_edit->deselect();
+			MessageQueue::get_singleton()->flush();
 			CHECK_FALSE(text_edit->has_selection());
+			SIGNAL_CHECK_FALSE("caret_changed");
 
+			// Select part of a line.
 			text_edit->select(0, 4, 0, 8);
+			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == " is ");
+			CHECK(text_edit->is_caret_after_selection_origin(0));
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 4);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 8);
+			CHECK(text_edit->get_selection_from_line(0) == text_edit->get_selection_origin_line(0));
+			CHECK(text_edit->get_selection_from_column(0) == text_edit->get_selection_origin_column(0));
+			CHECK(text_edit->get_selection_to_line(0) == text_edit->get_caret_line(0));
+			CHECK(text_edit->get_selection_to_column(0) == text_edit->get_caret_column(0));
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
 
 			text_edit->deselect();
+			MessageQueue::get_singleton()->flush();
 			CHECK_FALSE(text_edit->has_selection());
+			SIGNAL_CHECK_FALSE("caret_changed");
 
+			// Select part of a line in the other direction.
 			text_edit->select(0, 8, 0, 4);
+			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_selected_text() == " is ");
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(0));
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 8);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			CHECK(text_edit->get_selection_from_line(0) == text_edit->get_caret_line(0));
+			CHECK(text_edit->get_selection_from_column(0) == text_edit->get_caret_column(0));
+			CHECK(text_edit->get_selection_to_line(0) == text_edit->get_selection_origin_line(0));
+			CHECK(text_edit->get_selection_to_column(0) == text_edit->get_selection_origin_column(0));
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
 
+			// Cannot select when disabled.
 			text_edit->set_selecting_enabled(false);
 			CHECK_FALSE(text_edit->has_selection());
 			text_edit->select(0, 8, 0, 4);
+			MessageQueue::get_singleton()->flush();
 			CHECK_FALSE(text_edit->has_selection());
+			SIGNAL_CHECK_FALSE("caret_changed");
 			text_edit->set_selecting_enabled(true);
+		}
 
-			text_edit->select(0, 8, 0, 4);
-			CHECK(text_edit->has_selection());
-			SEND_GUI_ACTION("ui_text_caret_right");
+		SUBCASE("[TextEdit] delete selection") {
+			text_edit->set_text("this is some text\nfor selection");
+			MessageQueue::get_singleton()->flush();
+
+			// Delete selection does nothing if there is no selection.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(8);
 			CHECK_FALSE(text_edit->has_selection());
 
 			text_edit->delete_selection();
 			CHECK(text_edit->get_text() == "this is some text\nfor selection");
+			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 8);
 
-			text_edit->select(0, 8, 0, 4);
+			// Backspace removes selection.
+			text_edit->select(0, 4, 0, 8);
 			CHECK(text_edit->has_selection());
 			SEND_GUI_ACTION("ui_text_backspace");
+			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_text() == "thissome text\nfor selection");
 			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 4);
 
+			// Undo restores previous selection.
 			text_edit->undo();
-			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_text() == "this is some text\nfor selection");
+			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 8);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 4);
 
+			// Redo restores caret.
 			text_edit->redo();
-			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_text() == "thissome text\nfor selection");
+			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 4);
 
 			text_edit->undo();
-			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_text() == "this is some text\nfor selection");
+			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 8);
 
-			text_edit->select(0, 8, 0, 4);
+			text_edit->select(0, 4, 0, 8);
 			CHECK(text_edit->has_selection());
 
+			// Delete selection removes text, deselects, and moves caret.
 			text_edit->delete_selection();
-			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_text() == "thissome text\nfor selection");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 4);
 
+			// Undo delete works.
 			text_edit->undo();
-			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_text() == "this is some text\nfor selection");
+			CHECK(text_edit->has_selection());
 			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 8);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 4);
 
+			// Redo delete works.
 			text_edit->redo();
-			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_text() == "thissome text\nfor selection");
+			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 4);
 
@@ -1267,19 +2284,227 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 8);
 
+			// Can still delete if not editable.
 			text_edit->set_editable(false);
 			text_edit->delete_selection();
 			text_edit->set_editable(false);
 			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_text() == "thissome text\nfor selection");
 
+			// Cannot undo since it was not editable.
 			text_edit->undo();
 			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_text() == "thissome text\nfor selection");
+
+			// Delete multiple adjacent selections on the same line.
+			text_edit->select(0, 0, 0, 5);
+			text_edit->add_caret(0, 8);
+			text_edit->select(0, 5, 0, 8, 1);
+			CHECK(text_edit->get_caret_count() == 2);
+			text_edit->delete_selection();
+			CHECK(text_edit->get_text() == " text\nfor selection");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 0);
+
+			// Delete mulitline selection. Ignore non selections.
+			text_edit->remove_secondary_carets();
+			text_edit->select(1, 3, 0, 2);
+			text_edit->add_caret(1, 7);
+			text_edit->delete_selection();
+			CHECK(text_edit->get_text() == " t selection");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 2);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 6);
 		}
 
-		// Add readonly test?
 		SUBCASE("[TextEdit] text drag") {
+			text_edit->set_size(Size2(200, 200));
+			text_edit->set_text("drag test\ndrop here ''");
+			text_edit->grab_click_focus();
+			MessageQueue::get_singleton()->flush();
+
+			// Drag and drop selected text to mouse position.
+			text_edit->select(0, 0, 0, 4);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 2).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 7).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "drag");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 4);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 0);
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 11).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(1, 11).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == " test\ndrop here 'drag'");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 15);
+			CHECK(text_edit->get_selection_origin_line() == 1);
+			CHECK(text_edit->get_selection_origin_column() == 11);
+
+			// Undo.
+			text_edit->undo();
+			CHECK(text_edit->get_text() == "drag test\ndrop here ''");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 4);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 0);
+
+			// Redo.
+			text_edit->redo();
+			CHECK(text_edit->get_text() == " test\ndrop here 'drag'");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 15);
+			CHECK(text_edit->get_selection_origin_line() == 1);
+			CHECK(text_edit->get_selection_origin_column() == 11);
+
+			// Hold control when dropping to not delete selected text.
+			text_edit->select(1, 10, 1, 16);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 12).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 7).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "'drag'");
+			CHECK(text_edit->has_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 0).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_KEY_EVENT(Key::CMD_OR_CTRL);
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(0, 0).get_center(), MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			SEND_GUI_KEY_UP_EVENT(Key::CMD_OR_CTRL);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "'drag' test\ndrop here 'drag'");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 6);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 0);
+
+			// Multiple caret drags entire selection.
+			text_edit->select(0, 11, 0, 7, 0);
+			text_edit->add_caret(1, 2);
+			text_edit->select(1, 2, 1, 4, 1);
+			text_edit->add_caret(1, 12);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 3).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection(true, 1));
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 12).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "test\nop");
+			// Carets aren't removed from dragging, only dropping.
+			CHECK(text_edit->get_caret_count() == 3);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 7);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 11);
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 4);
+			CHECK(text_edit->get_selection_origin_line(1) == 1);
+			CHECK(text_edit->get_selection_origin_column(1) == 2);
+			CHECK_FALSE(text_edit->has_selection(2));
+			CHECK(text_edit->get_caret_line(2) == 1);
+			CHECK(text_edit->get_caret_column(2) == 12);
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 9).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(1, 9).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "'drag' \ndr heretest\nop 'drag'");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 2);
+			CHECK(text_edit->get_caret_column() == 2);
+			CHECK(text_edit->get_selection_origin_line() == 1);
+			CHECK(text_edit->get_selection_origin_column() == 7);
+
+			// Drop onto same selection should do effectively nothing.
+			text_edit->select(1, 3, 1, 7);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(1, 6).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 1).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "here");
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(1, 7).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "'drag' \ndr heretest\nop 'drag'");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 7);
+			CHECK(text_edit->get_selection_origin_line() == 1);
+			CHECK(text_edit->get_selection_origin_column() == 3);
+
+			// Cannot drag when drag and drop selection is disabled. It becomes regular drag to select.
+			text_edit->set_drag_and_drop_selection_enabled(false);
+			text_edit->select(0, 1, 0, 5);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 2).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK_FALSE(text_edit->is_mouse_over_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 7).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(1, 7).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "'drag' \ndr heretest\nop 'drag'");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 7);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 2);
+			text_edit->set_drag_and_drop_selection_enabled(true);
+
+			// Cancel drag and drop from Escape key.
+			text_edit->select(0, 1, 0, 5);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 3).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 1).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "drag");
+			SEND_GUI_KEY_EVENT(Key::ESCAPE);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "'drag' \ndr heretest\nop 'drag'");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 5);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 1);
+
+			// Cancel drag and drop from caret move key input.
+			text_edit->select(0, 1, 0, 5);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 3).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 1).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "drag");
+			SEND_GUI_KEY_EVENT(Key::RIGHT);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "'drag' \ndr heretest\nop 'drag'");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 5);
+
+			// Cancel drag and drop from text key input.
+			text_edit->select(0, 1, 0, 5);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 3).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 1).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "drag");
+			SEND_GUI_KEY_EVENT(Key::A);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "'A' \ndr heretest\nop 'drag'");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 2);
+		}
+
+		SUBCASE("[TextEdit] text drag to another text edit") {
 			TextEdit *target_text_edit = memnew(TextEdit);
 			SceneTree::get_singleton()->get_root()->add_child(target_text_edit);
 
@@ -1292,27 +2517,223 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			text_edit->set_text("drag me");
 			text_edit->select_all();
 			text_edit->grab_click_focus();
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 7);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 0);
 			MessageQueue::get_singleton()->flush();
 
-			Point2i line_0 = text_edit->get_pos_at_line_column(0, 0);
-			line_0.y /= 2;
-			SEND_GUI_MOUSE_BUTTON_EVENT(line_0, MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			// Drag text between text edits.
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 0).get_center(), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
 			CHECK(text_edit->is_mouse_over_selection());
-			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_pos_at_line_column(0, 7), MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 7).get_center(), MouseButtonMask::LEFT, Key::NONE);
 			CHECK(text_edit->get_viewport()->gui_is_dragging());
 			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "drag me");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 7);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 0);
 
-			line_0 = target_text_edit->get_pos_at_line_column(0, 0);
-			line_0.y /= 2;
-			line_0.x += 401; // As empty add one.
-			SEND_GUI_MOUSE_MOTION_EVENT(line_0, MouseButtonMask::LEFT, Key::NONE);
+			Point2i target_line0 = target_text_edit->get_position() + Point2i(1, target_text_edit->get_line_height() / 2);
+			SEND_GUI_MOUSE_MOTION_EVENT(target_line0, MouseButtonMask::LEFT, Key::NONE);
 			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(target_text_edit->get_caret_line() == 0);
+			CHECK(target_text_edit->get_caret_column() == 0);
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(target_line0, MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(target_text_edit->get_text() == "drag me");
+			CHECK(target_text_edit->has_selection());
+			CHECK(target_text_edit->get_caret_line() == 0);
+			CHECK(target_text_edit->get_caret_column() == 7);
+			CHECK(target_text_edit->get_selection_origin_line() == 0);
+			CHECK(target_text_edit->get_selection_origin_column() == 0);
 
-			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(line_0, MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			// Undo is separate per TextEdit.
+			text_edit->undo();
+			CHECK(text_edit->get_text() == "drag me");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 7);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 0);
+			CHECK(target_text_edit->get_text() == "drag me");
+			CHECK(target_text_edit->has_selection());
+			CHECK(target_text_edit->get_caret_line() == 0);
+			CHECK(target_text_edit->get_caret_column() == 7);
+			CHECK(target_text_edit->get_selection_origin_line() == 0);
+			CHECK(target_text_edit->get_selection_origin_column() == 0);
+
+			target_text_edit->undo();
+			CHECK(text_edit->get_text() == "drag me");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 7);
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 0);
+			CHECK(target_text_edit->get_text() == "");
+			CHECK_FALSE(target_text_edit->has_selection());
+			CHECK(target_text_edit->get_caret_line() == 0);
+			CHECK(target_text_edit->get_caret_column() == 0);
+
+			// Redo is also separate.
+			text_edit->redo();
+			CHECK(text_edit->get_text() == "");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(target_text_edit->get_text() == "");
+			CHECK_FALSE(target_text_edit->has_selection());
+			CHECK(target_text_edit->get_caret_line() == 0);
+			CHECK(target_text_edit->get_caret_column() == 0);
 
-			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			target_text_edit->redo();
 			CHECK(text_edit->get_text() == "");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 0);
 			CHECK(target_text_edit->get_text() == "drag me");
+			CHECK(target_text_edit->has_selection());
+			CHECK(target_text_edit->get_caret_line() == 0);
+			CHECK(target_text_edit->get_caret_column() == 7);
+			CHECK(target_text_edit->get_selection_origin_line() == 0);
+			CHECK(target_text_edit->get_selection_origin_column() == 0);
+
+			// Hold control to not remove selected text.
+			text_edit->set_text("drag test\ndrop test");
+			MessageQueue::get_singleton()->flush();
+			target_text_edit->select(0, 0, 0, 3, 0);
+			target_text_edit->add_caret(0, 5);
+			text_edit->select(0, 5, 0, 7, 0);
+			text_edit->add_caret(0, 1);
+			text_edit->select(0, 1, 0, 0, 1);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 5).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection(true, 0));
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 6).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "d\nte");
+			CHECK(text_edit->has_selection());
+			SEND_GUI_KEY_EVENT(Key::CMD_OR_CTRL);
+			SEND_GUI_MOUSE_MOTION_EVENT(target_text_edit->get_position() + target_text_edit->get_rect_at_line_column(0, 6).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(target_text_edit->get_position() + target_text_edit->get_rect_at_line_column(0, 6).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			SEND_GUI_KEY_UP_EVENT(Key::CMD_OR_CTRL);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "drag test\ndrop test");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 7);
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 0);
+			CHECK(target_text_edit->get_text() == "drag md\ntee");
+			CHECK(target_text_edit->get_caret_count() == 1);
+			CHECK(target_text_edit->has_selection());
+			CHECK(target_text_edit->get_caret_line() == 1);
+			CHECK(target_text_edit->get_caret_column() == 2);
+			CHECK(target_text_edit->get_selection_origin_line() == 0);
+			CHECK(target_text_edit->get_selection_origin_column() == 6);
+
+			// Drop onto selected text deletes the selected text first.
+			text_edit->set_deselect_on_focus_loss_enabled(false);
+			target_text_edit->set_deselect_on_focus_loss_enabled(false);
+			text_edit->remove_secondary_carets();
+			text_edit->select(0, 5, 0, 9);
+			target_text_edit->select(0, 6, 0, 8);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 6).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection(true, 0));
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 7).get_center(), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "test");
+			CHECK(text_edit->has_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(target_text_edit->get_position() + target_text_edit->get_rect_at_line_column(0, 7).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(target_text_edit->get_position() + target_text_edit->get_rect_at_line_column(0, 7).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "drag \ndrop test");
+			CHECK(target_text_edit->get_caret_count() == 1);
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 5);
+			CHECK(target_text_edit->get_text() == "drag mdtest\ntee");
+			CHECK(target_text_edit->has_selection());
+			CHECK(target_text_edit->get_caret_line() == 0);
+			CHECK(target_text_edit->get_caret_column() == 11);
+			CHECK(target_text_edit->get_selection_origin_line() == 0);
+			CHECK(target_text_edit->get_selection_origin_column() == 7);
+			text_edit->set_deselect_on_focus_loss_enabled(true);
+			target_text_edit->set_deselect_on_focus_loss_enabled(true);
+
+			// Can drop even when drag and drop selection is disabled.
+			target_text_edit->set_drag_and_drop_selection_enabled(false);
+			text_edit->select(0, 4, 0, 5);
+			target_text_edit->deselect();
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 4).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 7).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == " ");
+			CHECK(text_edit->has_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(target_text_edit->get_position() + target_text_edit->get_rect_at_line_column(0, 2).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(target_text_edit->get_position() + target_text_edit->get_rect_at_line_column(0, 7).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "drag\ndrop test");
+			CHECK(target_text_edit->get_text() == "drag md test\ntee");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 4);
+			CHECK(target_text_edit->has_selection());
+			CHECK(target_text_edit->get_caret_line() == 0);
+			CHECK(target_text_edit->get_caret_column() == 8);
+			CHECK(target_text_edit->get_selection_origin_line() == 0);
+			CHECK(target_text_edit->get_selection_origin_column() == 7);
+			target_text_edit->set_drag_and_drop_selection_enabled(true);
+
+			// Cannot drop when not editable.
+			target_text_edit->set_editable(false);
+			text_edit->select(0, 1, 0, 4);
+			target_text_edit->deselect();
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 2).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 7).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "rag");
+			CHECK(text_edit->has_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(target_text_edit->get_position() + target_text_edit->get_rect_at_line_column(0, 2).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(target_text_edit->get_position() + target_text_edit->get_rect_at_line_column(0, 2).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "drag\ndrop test");
+			CHECK(target_text_edit->get_text() == "drag md test\ntee");
+			CHECK(text_edit->has_selection());
+			CHECK_FALSE(target_text_edit->has_selection());
+			target_text_edit->set_editable(true);
+
+			// Can drag when not editable, but text will not be removed.
+			text_edit->set_editable(false);
+			text_edit->select(0, 0, 0, 4);
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 2).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->is_mouse_over_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 7).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			CHECK(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_viewport()->gui_get_drag_data() == "drag");
+			CHECK(text_edit->has_selection());
+			SEND_GUI_MOUSE_MOTION_EVENT(target_text_edit->get_position() + target_text_edit->get_rect_at_line_column(0, 4).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(target_text_edit->get_position() + target_text_edit->get_rect_at_line_column(0, 4).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::NONE, Key::NONE);
+			CHECK_FALSE(text_edit->get_viewport()->gui_is_dragging());
+			CHECK(text_edit->get_text() == "drag\ndrop test");
+			CHECK(target_text_edit->get_text() == "dragdrag md test\ntee");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 4);
+			CHECK(target_text_edit->has_selection());
+			CHECK(target_text_edit->get_caret_line() == 0);
+			CHECK(target_text_edit->get_caret_column() == 8);
+			CHECK(target_text_edit->get_selection_origin_line() == 0);
+			CHECK(target_text_edit->get_selection_origin_column() == 4);
+			text_edit->set_editable(true);
 
 			memdelete(target_text_edit);
 		}
@@ -1324,44 +2745,41 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 	}
 
 	SUBCASE("[TextEdit] overridable actions") {
+		DisplayServerMock *DS = (DisplayServerMock *)(DisplayServer::get_singleton());
+
 		SIGNAL_WATCH(text_edit, "text_set");
 		SIGNAL_WATCH(text_edit, "text_changed");
 		SIGNAL_WATCH(text_edit, "lines_edited_from");
 		SIGNAL_WATCH(text_edit, "caret_changed");
 
-		Array args1;
-		args1.push_back(0);
-		args1.push_back(0);
-		Array lines_edited_args;
-		lines_edited_args.push_back(args1);
+		Array lines_edited_args = build_array(build_array(0, 0));
 
 		SUBCASE("[TextEdit] backspace") {
 			text_edit->set_text("this is\nsome\n");
 			text_edit->set_caret_line(0);
 			text_edit->set_caret_column(0);
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
+			// Cannot backspace at start of text.
 			text_edit->backspace();
 			MessageQueue::get_singleton()->flush();
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
+			// Backspace at start of line removes the line.
 			text_edit->set_caret_line(2);
 			text_edit->set_caret_column(0);
 			MessageQueue::get_singleton()->flush();
 			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(2, 1));
 
-			((Array)lines_edited_args[0])[0] = 2;
-			((Array)lines_edited_args[0])[1] = 1;
 			text_edit->backspace();
 			MessageQueue::get_singleton()->flush();
-
 			CHECK(text_edit->get_text() == "this is\nsome");
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 4);
@@ -1369,10 +2787,10 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			((Array)lines_edited_args[0])[0] = 1;
+			// Backspace removes a character.
+			lines_edited_args = build_array(build_array(1, 1));
 			text_edit->backspace();
 			MessageQueue::get_singleton()->flush();
-
 			CHECK(text_edit->get_text() == "this is\nsom");
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 3);
@@ -1380,11 +2798,11 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Backspace when text is selected removes the selection.
 			text_edit->end_complex_operation();
 			text_edit->select(1, 0, 1, 3);
 			text_edit->backspace();
 			MessageQueue::get_singleton()->flush();
-
 			CHECK(text_edit->get_text() == "this is\n");
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 0);
@@ -1392,11 +2810,11 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Cannot backspace if not editable.
 			text_edit->set_editable(false);
 			text_edit->backspace();
 			text_edit->set_editable(true);
 			MessageQueue::get_singleton()->flush();
-
 			CHECK(text_edit->get_text() == "this is\n");
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 0);
@@ -1404,6 +2822,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
+			// Undo restores text to the previous end of complex operation.
 			text_edit->undo();
 			MessageQueue::get_singleton()->flush();
 			CHECK(text_edit->get_text() == "this is\nsom");
@@ -1412,98 +2831,736 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Redo.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "this is\n");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// See ui_text_backspace for more backspace tests.
 		}
 
 		SUBCASE("[TextEdit] cut") {
+			// Cut without a selection removes the entire line.
 			text_edit->set_text("this is\nsome\n");
 			text_edit->set_caret_line(0);
 			text_edit->set_caret_column(6);
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 0));
 
-			ERR_PRINT_OFF;
 			text_edit->cut();
 			MessageQueue::get_singleton()->flush();
-			ERR_PRINT_ON; // Can't check display server content.
-
-			((Array)lines_edited_args[0])[0] = 1;
+			CHECK(DS->clipboard_get() == "this is\n");
 			CHECK(text_edit->get_text() == "some\n");
 			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 4);
+			CHECK(text_edit->get_caret_column() == 3); // In the default font, this is the same position.
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			((Array)lines_edited_args[0])[0] = 0;
-			((Array)lines_edited_args[0])[1] = 1;
+			// Undo restores the cut text.
 			text_edit->undo();
 			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "this is\n");
 			CHECK(text_edit->get_text() == "this is\nsome\n");
 			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 6);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
-			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
 
-			((Array)lines_edited_args[0])[0] = 1;
-			((Array)lines_edited_args[0])[1] = 0;
+			// Redo.
 			text_edit->redo();
 			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "this is\n");
 			CHECK(text_edit->get_text() == "some\n");
 			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 4);
+			CHECK(text_edit->get_caret_column() == 3);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Cut with a selection removes just the selection.
 			text_edit->set_text("this is\nsome\n");
+			text_edit->select(0, 5, 0, 7);
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0));
 
-			((Array)lines_edited_args[0])[0] = 0;
-			text_edit->select(0, 5, 0, 7);
-			ERR_PRINT_OFF;
 			SEND_GUI_ACTION("ui_cut");
 			CHECK(text_edit->get_viewport()->is_input_handled());
 			MessageQueue::get_singleton()->flush();
-			ERR_PRINT_ON; // Can't check display server content.
+			CHECK(DS->clipboard_get() == "is");
 			CHECK(text_edit->get_text() == "this \nsome\n");
+			CHECK_FALSE(text_edit->get_caret_line());
 			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 5);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Cut does not change the text if not editable. Text is still added to clipboard.
+			text_edit->set_text("this is\nsome\n");
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(5);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+
 			text_edit->set_editable(false);
 			text_edit->cut();
 			MessageQueue::get_singleton()->flush();
 			text_edit->set_editable(true);
-			CHECK(text_edit->get_text() == "this \nsome\n");
+			CHECK(DS->clipboard_get() == "this is\n");
+			CHECK(text_edit->get_text() == "this is\nsome\n");
 			CHECK(text_edit->get_caret_line() == 0);
 			CHECK(text_edit->get_caret_column() == 5);
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
+
+			// Cut line with multiple carets.
+			text_edit->set_text("this is\nsome\n");
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(3);
+			text_edit->add_caret(0, 2);
+			text_edit->add_caret(0, 4);
+			text_edit->add_caret(2, 0);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 0), build_array(1, 0));
+
+			text_edit->cut();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "this is\n\n");
+			CHECK(text_edit->get_text() == "some");
+			CHECK(text_edit->get_caret_count() == 3);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 2); // In the default font, this is the same position.
+			// The previous caret at index 1 was merged.
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 3); // In the default font, this is the same position.
+			CHECK_FALSE(text_edit->has_selection(2));
+			CHECK(text_edit->get_caret_line(2) == 0);
+			CHECK(text_edit->get_caret_column(2) == 4);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			text_edit->remove_secondary_carets();
+
+			// Cut on the only line removes the contents.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0));
+
+			text_edit->cut();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "some\n");
+			CHECK(text_edit->get_text() == "");
+			CHECK(text_edit->get_line_count() == 1);
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Cut empty line.
+			text_edit->cut();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "\n");
+			CHECK(text_edit->get_text() == "");
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 0);
+			SIGNAL_CHECK_FALSE("caret_changed");
+			// These signals are emitted even if there is no change.
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Cut multiple lines, in order.
+			text_edit->set_text("this is\nsome\ntext to\nbe\n\ncut");
+			text_edit->set_caret_line(2);
+			text_edit->set_caret_column(7);
+			text_edit->add_caret(3, 0);
+			text_edit->add_caret(0, 2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 0), build_array(3, 2), build_array(2, 1));
+
+			text_edit->cut();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "this is\ntext to\nbe\n");
+			CHECK(text_edit->get_text() == "some\n\ncut");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 2);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			text_edit->remove_secondary_carets();
+
+			// Cut multiple selections, in order. Ignores regular carets.
+			text_edit->set_text("this is\nsome\ntext to\nbe\n\ncut");
+			text_edit->add_caret(3, 0);
+			text_edit->add_caret(0, 2);
+			text_edit->add_caret(2, 0);
+			text_edit->select(1, 0, 1, 2, 0);
+			text_edit->select(3, 0, 4, 0, 1);
+			text_edit->select(0, 5, 0, 3, 2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 1), build_array(4, 3), build_array(0, 0));
+
+			text_edit->cut();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "s \nso\nbe\n");
+			CHECK(text_edit->get_text() == "thiis\nme\ntext to\n\ncut");
+			CHECK(text_edit->get_caret_count() == 4);
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK(text_edit->get_caret_line(1) == 3);
+			CHECK(text_edit->get_caret_column(1) == 0);
+			CHECK(text_edit->get_caret_line(2) == 0);
+			CHECK(text_edit->get_caret_column(2) == 3);
+			CHECK(text_edit->get_caret_line(3) == 2);
+			CHECK(text_edit->get_caret_column(3) == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 		}
 
 		SUBCASE("[TextEdit] copy") {
-			// TODO: Cannot test need display server support.
+			text_edit->set_text("this is\nsome\ntest\n\ntext");
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+
+			// Copy selected text.
+			text_edit->select(0, 0, 1, 2, 0);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			DS->clipboard_set_primary("");
+
+			text_edit->copy();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "this is\nso");
+			CHECK(DS->clipboard_get_primary() == "");
+			CHECK(text_edit->get_text() == "this is\nsome\ntest\n\ntext");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 0);
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 2);
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+
+			// Copy with GUI action.
+			text_edit->select(0, 0, 0, 2, 0);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			SEND_GUI_ACTION("ui_copy");
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "th");
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+
+			// Can copy even if not editable.
+			text_edit->select(2, 4, 1, 2, 0);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			text_edit->set_editable(false);
+			text_edit->copy();
+			text_edit->set_editable(true);
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "me\ntest");
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+			text_edit->deselect();
+
+			// Copy full line when there is no selection.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			text_edit->copy();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "this is\n");
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+
+			// Copy empty line.
+			text_edit->set_caret_line(3);
+			text_edit->set_caret_column(0);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			text_edit->copy();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "\n");
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+			text_edit->deselect();
+
+			// Copy full line with multiple carets on that line only copies once.
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(2);
+			text_edit->add_caret(1, 0);
+			text_edit->add_caret(1, 4);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			text_edit->copy();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "some\n");
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+			text_edit->remove_secondary_carets();
+
+			// Copy selected text from all selections with `\n` in between, in order. Ignore regular carets.
+			text_edit->set_caret_line(2);
+			text_edit->set_caret_column(4);
+			text_edit->add_caret(4, 0);
+			text_edit->add_caret(0, 4);
+			text_edit->add_caret(1, 0);
+			text_edit->select(1, 3, 2, 4, 0);
+			text_edit->select(4, 4, 4, 0, 1);
+			text_edit->select(0, 5, 0, 4, 2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			text_edit->copy();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == " \ne\ntest\ntext");
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+			text_edit->remove_secondary_carets();
+			text_edit->deselect();
+
+			// Copy multiple lines with multiple carets, in order.
+			text_edit->set_caret_line(3);
+			text_edit->set_caret_column(0);
+			text_edit->add_caret(4, 2);
+			text_edit->add_caret(0, 4);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			text_edit->copy();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "this is\n\ntext\n");
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
 		}
 
 		SUBCASE("[TextEdit] paste") {
-			// TODO: Cannot test need display server support.
+			// Paste text from clipboard at caret.
+			text_edit->set_text("this is\nsome\n\ntext");
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 1));
+			DS->clipboard_set("paste");
+
+			text_edit->paste();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "paste");
+			CHECK(text_edit->get_text() == "this is\nsopasteme\n\ntext");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 7);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Undo.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "paste");
+			CHECK(text_edit->get_text() == "this is\nsome\n\ntext");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 2);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Redo.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "paste");
+			CHECK(text_edit->get_text() == "this is\nsopasteme\n\ntext");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 7);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Paste on empty line. Use GUI action.
+			text_edit->set_text("this is\nsome\n\ntext");
+			text_edit->set_caret_line(2);
+			text_edit->set_caret_column(0);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(2, 2));
+			DS->clipboard_set("paste2");
+
+			SEND_GUI_ACTION("ui_paste");
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "paste2");
+			CHECK(text_edit->get_text() == "this is\nsome\npaste2\ntext");
+			CHECK(text_edit->get_caret_line() == 2);
+			CHECK(text_edit->get_caret_column() == 6);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Paste removes selection before pasting.
+			text_edit->set_text("this is\nsome\n\ntext");
+			text_edit->select(0, 5, 1, 3);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 0), build_array(0, 0));
+			DS->clipboard_set("paste");
+
+			text_edit->paste();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "paste");
+			CHECK(text_edit->get_text() == "this pastee\n\ntext");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 10);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Paste multiple lines.
+			text_edit->set_text("this is\nsome\n\ntext");
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 3));
+			DS->clipboard_set("multi\n\nline\npaste");
+
+			text_edit->paste();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "multi\n\nline\npaste");
+			CHECK(text_edit->get_text() == "tmulti\n\nline\npastehis is\nsome\n\ntext");
+			CHECK(text_edit->get_caret_line() == 3);
+			CHECK(text_edit->get_caret_column() == 5);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Paste full line after copying it.
+			text_edit->set_text("this is\nsome\n\ntext");
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 2));
+			DS->clipboard_set("");
+			text_edit->copy();
+			text_edit->set_caret_column(3);
+			CHECK(DS->clipboard_get() == "some\n");
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			text_edit->paste();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "some\n");
+			CHECK(text_edit->get_text() == "this is\nsome\nsome\n\ntext");
+			CHECK(text_edit->get_caret_line() == 2);
+			CHECK(text_edit->get_caret_column() == 3);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Do not paste as line since it wasn't copied.
+			text_edit->set_text("this is\nsome\n\ntext");
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(4);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 1));
+			DS->clipboard_set("paste\n");
+
+			text_edit->paste();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "paste\n");
+			CHECK(text_edit->get_text() == "thispaste\n is\nsome\n\ntext");
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Paste text at each caret.
+			text_edit->set_text("this is\nsome\n\ntext");
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(2);
+			text_edit->add_caret(3, 4);
+			text_edit->add_caret(0, 4);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 1), build_array(2, 3), build_array(5, 6));
+			DS->clipboard_set("paste\ntest");
+
+			text_edit->paste();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "paste\ntest");
+			CHECK(text_edit->get_text() == "thispaste\ntest is\nsopaste\ntestme\n\ntextpaste\ntest");
+			CHECK(text_edit->get_caret_count() == 3);
+			CHECK(text_edit->get_caret_line(0) == 3);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			CHECK(text_edit->get_caret_line(1) == 6);
+			CHECK(text_edit->get_caret_column(1) == 4);
+			CHECK(text_edit->get_caret_line(2) == 1);
+			CHECK(text_edit->get_caret_column(2) == 4);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			text_edit->remove_secondary_carets();
+
+			// Paste line per caret when the amount of lines is equal to the number of carets.
+			text_edit->set_text("this is\nsome\n\ntext");
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(2);
+			text_edit->add_caret(3, 4);
+			text_edit->add_caret(0, 4);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0), build_array(1, 1), build_array(3, 3));
+			DS->clipboard_set("paste\ntest\n1");
+
+			text_edit->paste();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "paste\ntest\n1");
+			CHECK(text_edit->get_text() == "thispaste is\nsotestme\n\ntext1");
+			CHECK(text_edit->get_caret_count() == 3);
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 6);
+			CHECK(text_edit->get_caret_line(1) == 3);
+			CHECK(text_edit->get_caret_column(1) == 5);
+			CHECK(text_edit->get_caret_line(2) == 0);
+			CHECK(text_edit->get_caret_column(2) == 9);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			text_edit->remove_secondary_carets();
+
+			// Cannot paste when not editable.
+			text_edit->set_text("this is\nsome\n\ntext");
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(4);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			DS->clipboard_set("no paste");
+
+			text_edit->set_editable(false);
+			text_edit->paste();
+			text_edit->set_editable(true);
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "no paste");
+			CHECK(text_edit->get_text() == "this is\nsome\n\ntext");
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 4);
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
 		}
 
 		SUBCASE("[TextEdit] paste primary") {
-			// TODO: Cannot test need display server support.
+			// Set size for mouse input.
+			text_edit->set_size(Size2(200, 200));
+
+			text_edit->grab_focus();
+			DS->clipboard_set("");
+			DS->clipboard_set_primary("");
+			CHECK(DS->clipboard_get_primary() == "");
+
+			// Select text with mouse to put into primary clipboard.
+			text_edit->set_text("this is\nsome\n\ntext");
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(0, 2).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 3).get_center() + Point2i(2, 0), MouseButtonMask::LEFT, Key::NONE);
+			SEND_GUI_MOUSE_BUTTON_RELEASED_EVENT(text_edit->get_rect_at_line_column(1, 3).get_center() + Point2i(2, 0), MouseButton::LEFT, MouseButtonMask::LEFT, Key::NONE);
+			CHECK(DS->clipboard_get() == "");
+			CHECK(DS->clipboard_get_primary() == "is is\nsom");
+			CHECK(text_edit->get_text() == "this is\nsome\n\ntext");
+			CHECK(text_edit->has_selection());
+			CHECK(text_edit->get_selected_text() == "is is\nsom");
+			CHECK(text_edit->get_selection_origin_line() == 0);
+			CHECK(text_edit->get_selection_origin_column() == 2);
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 3);
+			SIGNAL_CHECK_FALSE("text_set");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+
+			// Middle click to paste at mouse.
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(3, 4));
+
+			SEND_GUI_MOUSE_BUTTON_EVENT(text_edit->get_rect_at_line_column(3, 2).get_center() + Point2i(2, 0), MouseButton::MIDDLE, MouseButtonMask::MIDDLE, Key::NONE);
+			CHECK(DS->clipboard_get_primary() == "is is\nsom");
+			CHECK(text_edit->get_text() == "this is\nsome\n\nteis is\nsomxt");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 4);
+			CHECK(text_edit->get_caret_column() == 3);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Paste at mouse position if there is only one caret.
+			text_edit->set_text("this is\nsome\n\ntext");
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 1).get_center() + Point2i(2, 0), MouseButtonMask::NONE, Key::NONE);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			DS->clipboard_set_primary("paste");
+			lines_edited_args = build_array(build_array(0, 0));
+
+			text_edit->paste_primary_clipboard();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get_primary() == "paste");
+			CHECK(text_edit->get_text() == "tpastehis is\nsome\n\ntext");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 6);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Paste at all carets if there are multiple carets.
+			text_edit->set_text("this is\nsome\n\ntext");
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(0);
+			text_edit->add_caret(2, 0);
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(0, 1).get_center() + Point2i(2, 0), MouseButtonMask::NONE, Key::NONE);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			DS->clipboard_set_primary("paste");
+			lines_edited_args = build_array(build_array(1, 1), build_array(2, 2));
+
+			text_edit->paste_primary_clipboard();
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get_primary() == "paste");
+			CHECK(text_edit->get_text() == "this is\npastesome\npaste\ntext");
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 5);
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 5);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Cannot paste if not editable.
+			text_edit->set_text("this is\nsome\n\ntext");
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(4);
+			SEND_GUI_MOUSE_MOTION_EVENT(text_edit->get_rect_at_line_column(1, 3).get_center() + Point2i(2, 0), MouseButtonMask::NONE, Key::NONE);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			DS->clipboard_set("no paste");
+
+			text_edit->set_editable(false);
+			text_edit->paste_primary_clipboard();
+			text_edit->set_editable(true);
+			MessageQueue::get_singleton()->flush();
+			CHECK(DS->clipboard_get() == "no paste");
+			CHECK(text_edit->get_text() == "this is\nsome\n\ntext");
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 4);
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
 		}
 
 		SIGNAL_UNWATCH(text_edit, "text_set");
@@ -1512,60 +3569,77 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 		SIGNAL_UNWATCH(text_edit, "caret_changed");
 	}
 
-	// Add undo / redo tests?
 	SUBCASE("[TextEdit] input") {
 		SIGNAL_WATCH(text_edit, "text_set");
 		SIGNAL_WATCH(text_edit, "text_changed");
 		SIGNAL_WATCH(text_edit, "lines_edited_from");
 		SIGNAL_WATCH(text_edit, "caret_changed");
 
-		Array args1;
-		args1.push_back(0);
-		args1.push_back(0);
-		Array lines_edited_args;
-		lines_edited_args.push_back(args1);
+		Array lines_edited_args = build_array(build_array(0, 0));
 
 		SUBCASE("[TextEdit] ui_text_newline_above") {
 			text_edit->set_text("this is some test text.\nthis is some test text.");
-			text_edit->select(0, 0, 0, 4);
-			text_edit->set_caret_column(4);
-
-			text_edit->add_caret(1, 4);
-			text_edit->select(1, 0, 1, 4, 1);
-			CHECK(text_edit->get_caret_count() == 2);
-
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
-			// For the second caret.
-			Array args2;
-			args2.push_back(0);
-			args2.push_back(1);
-			lines_edited_args.push_front(args2);
+			// Insert new line above.
+			text_edit->select(0, 0, 0, 4);
+			text_edit->add_caret(1, 4);
+			CHECK(text_edit->get_caret_count() == 2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 1), build_array(2, 3));
 
-			((Array)lines_edited_args[1])[1] = 1;
 			SEND_GUI_ACTION("ui_text_newline_above");
 			CHECK(text_edit->get_viewport()->is_input_handled());
 			CHECK(text_edit->get_text() == "\nthis is some test text.\n\nthis is some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 2);
 			CHECK(text_edit->get_caret_column(1) == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Undo.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "this is some test text.\nthis is some test text.");
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 0);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 4);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
+
+			// Redo.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "\nthis is some test text.\n\nthis is some test text.");
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 0);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Does not work if not editable.
 			text_edit->set_caret_line(1);
 			text_edit->set_caret_column(4);
-
-			text_edit->set_caret_line(3, false, true, 0, 1);
+			text_edit->set_caret_line(3, false, true, -1, 1);
 			text_edit->set_caret_column(4, false, 1);
 			MessageQueue::get_singleton()->flush();
 			SIGNAL_DISCARD("caret_changed");
@@ -1574,31 +3648,57 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SEND_GUI_ACTION("ui_text_newline_above");
 			CHECK(text_edit->get_viewport()->is_input_handled());
 			CHECK(text_edit->get_text() == "\nthis is some test text.\n\nthis is some test text.");
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 4);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 3);
 			CHECK(text_edit->get_caret_column(1) == 4);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			text_edit->set_editable(true);
 
-			((Array)lines_edited_args[0])[0] = 2;
-			((Array)lines_edited_args[0])[1] = 3;
+			// Works on first line, empty lines, and only happens at caret for selections.
+			text_edit->select(1, 10, 0, 0);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 1), build_array(4, 5));
 
 			SEND_GUI_ACTION("ui_text_newline_above");
 			CHECK(text_edit->get_viewport()->is_input_handled());
 			CHECK(text_edit->get_text() == "\n\nthis is some test text.\n\n\nthis is some test text.");
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 0);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 4);
 			CHECK(text_edit->get_caret_column(1) == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Insert multiple new lines above from one line.
+			text_edit->set_text("test");
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(1);
+			text_edit->add_caret(0, 3);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 1), build_array(1, 2));
+
+			SEND_GUI_ACTION("ui_text_newline_above");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_text() == "\n\ntest");
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 0);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
@@ -1606,34 +3706,55 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 
 		SUBCASE("[TextEdit] ui_text_newline_blank") {
 			text_edit->set_text("this is some test text.\nthis is some test text.");
-			text_edit->select(0, 0, 0, 4);
-			text_edit->set_caret_column(4);
-
-			text_edit->add_caret(1, 4);
-			text_edit->select(1, 0, 1, 4, 1);
-			CHECK(text_edit->get_caret_count() == 2);
-
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
-			SIGNAL_DISCARD("caret_changed");
 
-			// For the second caret.
-			Array args2;
-			args2.push_back(1);
-			args2.push_back(2);
-			lines_edited_args.push_front(args2);
+			// Insert new line below.
+			text_edit->select(0, 0, 0, 4);
+			text_edit->add_caret(1, 4);
+			CHECK(text_edit->get_caret_count() == 2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 1), build_array(2, 3));
 
-			((Array)lines_edited_args[1])[1] = 1;
 			SEND_GUI_ACTION("ui_text_newline_blank");
 			CHECK(text_edit->get_viewport()->is_input_handled());
 			CHECK(text_edit->get_text() == "this is some test text.\n\nthis is some test text.\n");
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 0);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 3);
+			CHECK(text_edit->get_caret_column(1) == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Undo.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "this is some test text.\nthis is some test text.");
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 4);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
 
+			// Redo.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "this is some test text.\n\nthis is some test text.\n");
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(0));
 			CHECK(text_edit->get_caret_line(1) == 3);
 			CHECK(text_edit->get_caret_column(1) == 0);
 			CHECK_FALSE(text_edit->has_selection(1));
@@ -1641,75 +3762,119 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Does not work if not editable.
 			text_edit->set_editable(false);
 			SEND_GUI_ACTION("ui_text_newline_blank");
 			CHECK(text_edit->get_viewport()->is_input_handled());
 			CHECK(text_edit->get_text() == "this is some test text.\n\nthis is some test text.\n");
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 0);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 3);
 			CHECK(text_edit->get_caret_column(1) == 0);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			text_edit->set_editable(true);
+
+			// Insert multiple new lines below from one line.
+			text_edit->set_text("test");
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(1);
+			text_edit->add_caret(0, 3);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 1), build_array(0, 1));
+
+			SEND_GUI_ACTION("ui_text_newline_blank");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_text() == "test\n\n");
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 2);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 		}
 
 		SUBCASE("[TextEdit] ui_text_newline") {
 			text_edit->set_text("this is some test text.\nthis is some test text.");
-			text_edit->select(0, 0, 0, 4);
-			text_edit->set_caret_column(4);
-
-			text_edit->add_caret(1, 4);
-			text_edit->select(1, 0, 1, 4, 1);
-			CHECK(text_edit->get_caret_count() == 2);
-
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
-			// For the second caret.
-			Array args2;
-			args2.push_back(1);
-			args2.push_back(1);
-			lines_edited_args.push_front(args2);
-			lines_edited_args.push_front(args2.duplicate());
-			((Array)lines_edited_args[1])[1] = 2;
-
-			lines_edited_args.push_back(lines_edited_args[2].duplicate());
-			((Array)lines_edited_args[3])[1] = 1;
+			// Insert new line at caret.
+			text_edit->select(0, 0, 0, 4);
+			text_edit->add_caret(1, 4);
+			CHECK(text_edit->get_caret_count() == 2);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			// Lines edited: deletion, insert line, insert line.
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 1), build_array(2, 3));
 
 			SEND_GUI_ACTION("ui_text_newline");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == "\n is some test text.\n\n is some test text.");
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == "\n is some test text.\nthis\n is some test text.");
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 3);
 			CHECK(text_edit->get_caret_column(1) == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Undo.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "this is some test text.\nthis is some test text.");
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 0);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 4);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
+
+			// Redo.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "\n is some test text.\nthis\n is some test text.");
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 3);
+			CHECK(text_edit->get_caret_column(1) == 0);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Does not work if not editable.
 			text_edit->set_editable(false);
 			SEND_GUI_ACTION("ui_text_newline");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == "\n is some test text.\n\n is some test text.");
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == "\n is some test text.\nthis\n is some test text.");
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 3);
 			CHECK(text_edit->get_caret_column(1) == 0);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
@@ -1717,255 +3882,399 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 		}
 
 		SUBCASE("[TextEdit] ui_text_backspace_all_to_left") {
-			text_edit->set_text("\nthis is some test text.\n\nthis is some test text.");
-			text_edit->select(1, 0, 1, 4);
-			text_edit->set_caret_line(1);
-			text_edit->set_caret_column(4);
-
-			text_edit->add_caret(3, 4);
-			text_edit->select(3, 0, 3, 4, 1);
-			CHECK(text_edit->get_caret_count() == 2);
-
-			MessageQueue::get_singleton()->flush();
-
 			Ref<InputEvent> tmpevent = InputEventKey::create_reference(Key::BACKSPACE | KeyModifierMask::ALT | KeyModifierMask::CMD_OR_CTRL);
 			InputMap::get_singleton()->action_add_event("ui_text_backspace_all_to_left", tmpevent);
 
+			text_edit->set_text("\nthis is some test text.\n\nthis is some test text.");
+			MessageQueue::get_singleton()->flush();
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
-			// For the second caret.
-			Array args2;
-			args2.push_back(3);
-			args2.push_back(3);
-			lines_edited_args.push_front(args2);
-
-			// With selection should be a normal backspace.
-			((Array)lines_edited_args[1])[0] = 1;
-			((Array)lines_edited_args[1])[1] = 1;
+			// Remove all text to the left.
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(5);
+			text_edit->add_caret(1, 2);
+			text_edit->add_caret(1, 8);
+			lines_edited_args = build_array(build_array(1, 1));
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
 
 			SEND_GUI_ACTION("ui_text_backspace_all_to_left");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == "\n is some test text.\n\n is some test text.");
+			CHECK(text_edit->get_text() == "\nsome test text.\n\nthis is some test text.");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK_FALSE(text_edit->has_selection());
 			CHECK(text_edit->get_caret_line() == 1);
 			CHECK(text_edit->get_caret_column() == 0);
-			CHECK_FALSE(text_edit->has_selection(0));
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			CHECK(text_edit->get_caret_line(1) == 3);
-			CHECK(text_edit->get_caret_column(1) == 0);
+			// Undo.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "\nthis is some test text.\n\nthis is some test text.");
+			CHECK(text_edit->get_caret_count() == 3);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 5);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 2);
+			CHECK_FALSE(text_edit->has_selection(2));
+			CHECK(text_edit->get_caret_line(2) == 1);
+			CHECK(text_edit->get_caret_column(2) == 8);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			((Array)lines_edited_args[0])[1] = 2;
-			((Array)lines_edited_args[1])[1] = 0;
+			// Redo.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "\nsome test text.\n\nthis is some test text.");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 1);
+			CHECK(text_edit->get_caret_column() == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Acts as a normal backspace with selections.
+			text_edit->select(1, 5, 1, 9, 0);
+			text_edit->add_caret(3, 4);
+			text_edit->select(3, 7, 3, 4, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(3, 3), build_array(1, 1));
 
-			// Start of line should also be a normal backspace.
 			SEND_GUI_ACTION("ui_text_backspace_all_to_left");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " is some test text.\n is some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == "\nsome  text.\n\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 5);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 3);
+			CHECK(text_edit->get_caret_column(1) == 4);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Acts as a normal backspace when at the start of a line.
+			text_edit->set_caret_column(0);
+			text_edit->set_caret_column(0, false, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(3, 2), build_array(1, 0));
 
+			SEND_GUI_ACTION("ui_text_backspace_all_to_left");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_text() == "some  text.\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == 0);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Does not work if not editable.
 			text_edit->set_caret_column(text_edit->get_line(0).length());
 			text_edit->set_caret_column(text_edit->get_line(1).length(), false, 1);
 			MessageQueue::get_singleton()->flush();
-
-			SIGNAL_DISCARD("text_set");
-			SIGNAL_DISCARD("text_changed");
-			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
 			text_edit->set_editable(false);
 			SEND_GUI_ACTION("ui_text_backspace_all_to_left");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " is some test text.\n is some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == text_edit->get_line(0).length());
+			CHECK(text_edit->get_text() == "some  text.\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == text_edit->get_line(0).length());
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == text_edit->get_line(1).length());
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			text_edit->set_editable(true);
 
-			((Array)lines_edited_args[0])[0] = 1;
-			((Array)lines_edited_args[0])[1] = 1;
-			((Array)lines_edited_args[1])[0] = 0;
+			// Remove entire line content when at the end of the line.
+			lines_edited_args = build_array(build_array(1, 1), build_array(0, 0));
 
 			SEND_GUI_ACTION("ui_text_backspace_all_to_left");
 			CHECK(text_edit->get_viewport()->is_input_handled());
 			CHECK(text_edit->get_text() == "\n");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == 0);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+			text_edit->remove_secondary_carets();
+
+			// Removing newline effectively happens after removing text.
+			text_edit->set_text("test\nlines");
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(0);
+			text_edit->add_caret(1, 4);
+
+			SEND_GUI_ACTION("ui_text_backspace_all_to_left");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_text() == "tests");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			text_edit->remove_secondary_carets();
+
+			// Removing newline effectively happens after removing text, reverse caret order.
+			text_edit->set_text("test\nlines");
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(4);
+			text_edit->add_caret(1, 0);
+
+			SEND_GUI_ACTION("ui_text_backspace_all_to_left");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_text() == "tests");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			text_edit->remove_secondary_carets();
 
 			InputMap::get_singleton()->action_erase_event("ui_text_backspace_all_to_left", tmpevent);
 		}
 
 		SUBCASE("[TextEdit] ui_text_backspace_word") {
 			text_edit->set_text("\nthis is some test text.\n\nthis is some test text.");
-			text_edit->select(1, 0, 1, 4);
-			text_edit->set_caret_line(1);
-			text_edit->set_caret_column(4);
-
-			text_edit->add_caret(3, 4);
-			text_edit->select(3, 0, 3, 4, 1);
-			CHECK(text_edit->get_caret_count() == 2);
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
-			SIGNAL_DISCARD("caret_changed");
 
-			// For the second caret.
-			Array args2;
-			args2.push_back(3);
-			args2.push_back(3);
-			lines_edited_args.push_front(args2);
-
-			// With selection should be a normal backspace.
-			((Array)lines_edited_args[1])[0] = 1;
-			((Array)lines_edited_args[1])[1] = 1;
+			// Acts as a normal backspace with selections.
+			text_edit->select(1, 8, 1, 15);
+			text_edit->add_caret(3, 6);
+			text_edit->select(3, 10, 3, 6, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(3, 3), build_array(1, 1));
 
 			SEND_GUI_ACTION("ui_text_backspace_word");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == "\n is some test text.\n\n is some test text.");
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == "\nthis is st text.\n\nthis ime test text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
-			CHECK(text_edit->get_caret_line(1) == 3);
-			CHECK(text_edit->get_caret_column(1) == 0);
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 8);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 3);
+			CHECK(text_edit->get_caret_column(1) == 6);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 			text_edit->end_complex_operation();
 
-			((Array)lines_edited_args[0])[1] = 2;
-			((Array)lines_edited_args[1])[1] = 0;
+			lines_edited_args = build_array(build_array(3, 2), build_array(1, 0));
 
 			// Start of line should also be a normal backspace.
+			text_edit->set_caret_column(0);
+			text_edit->set_caret_column(0, false, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
 			SEND_GUI_ACTION("ui_text_backspace_word");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " is some test text.\n is some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == "this is st text.\nthis ime test text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == 0);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Does not work if not editable.
 			text_edit->set_editable(false);
 			SEND_GUI_ACTION("ui_text_backspace_word");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " is some test text.\n is some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == "this is st text.\nthis ime test text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == 0);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			text_edit->set_editable(true);
 
+			// FIXME: Remove after GH-77101 is fixed.
+			text_edit->start_action(TextEdit::ACTION_NONE);
+
+			// Remove text to the start of the word to the left of the caret.
 			text_edit->set_caret_column(text_edit->get_line(0).length());
-			text_edit->set_caret_column(text_edit->get_line(1).length(), false, 1);
+			text_edit->set_caret_column(12, false, 1);
 			MessageQueue::get_singleton()->flush();
-
-			SIGNAL_DISCARD("text_set");
-			SIGNAL_DISCARD("text_changed");
-			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
-
-			((Array)lines_edited_args[0])[0] = 1;
-			((Array)lines_edited_args[0])[1] = 1;
-			((Array)lines_edited_args[1])[0] = 0;
+			lines_edited_args = build_array(build_array(1, 1), build_array(0, 0));
 
 			SEND_GUI_ACTION("ui_text_backspace_word");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " is some test \n is some test ");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 14);
+			CHECK(text_edit->get_text() == "this is st \nthis ime t text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 11);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 9);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Undo.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "this is st text.\nthis ime test text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 16);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
-			CHECK(text_edit->get_caret_column(1) == 14);
+			CHECK(text_edit->get_caret_column(1) == 12);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
+
+			// Redo.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "this is st \nthis ime t text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 11);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 9);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
-		}
 
-		SUBCASE("[TextEdit] ui_text_backspace_word same line") {
-			text_edit->set_text("test test test");
-			text_edit->set_caret_column(4);
-			text_edit->add_caret(0, 9);
-			text_edit->add_caret(0, 15);
+			// Removing newline effectively happens after removing text.
+			text_edit->set_text("test\nlines");
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(0);
+			text_edit->add_caret(1, 4);
 
-			// For the second caret.
-			Array args2;
-			args2.push_back(0);
-			lines_edited_args.push_front(args2);
+			SEND_GUI_ACTION("ui_text_backspace_word");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_text() == "tests");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			text_edit->remove_secondary_carets();
 
-			// For the third caret.
-			Array args3;
-			args2.push_back(0);
-			lines_edited_args.push_front(args2);
+			// Removing newline effectively happens after removing text, reverse caret order.
+			text_edit->set_text("test\nlines");
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(4);
+			text_edit->add_caret(1, 0);
 
-			CHECK(text_edit->get_caret_count() == 3);
-			MessageQueue::get_singleton()->flush();
+			SEND_GUI_ACTION("ui_text_backspace_word");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_text() == "tests");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			text_edit->remove_secondary_carets();
+		}
 
+		SUBCASE("[TextEdit] ui_text_backspace_word same line") {
+			text_edit->set_text("test longwordtest test");
+			MessageQueue::get_singleton()->flush();
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
+			// Multiple carets on the same line is handled.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(4);
+			text_edit->add_caret(0, 11);
+			text_edit->add_caret(0, 15);
+			text_edit->add_caret(0, 9);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 0));
+
 			SEND_GUI_ACTION("ui_text_backspace_word");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == "  ");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == " st test");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 0);
 			CHECK(text_edit->get_caret_column(1) == 1);
-			CHECK_FALSE(text_edit->has_selection(1));
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			CHECK(text_edit->get_caret_line(2) == 0);
-			CHECK(text_edit->get_caret_column(2) == 2);
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test longwordtest test");
+			CHECK(text_edit->get_caret_count() == 4);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 11);
+			CHECK_FALSE(text_edit->has_selection(2));
+			CHECK(text_edit->get_caret_line(2) == 0);
+			CHECK(text_edit->get_caret_column(2) == 15);
+			CHECK_FALSE(text_edit->has_selection(3));
+			CHECK(text_edit->get_caret_line(3) == 0);
+			CHECK(text_edit->get_caret_column(3) == 9);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
 
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == " st test");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 1);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
@@ -1973,130 +4282,267 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 
 		SUBCASE("[TextEdit] ui_text_backspace") {
 			text_edit->set_text("\nthis is some test text.\n\nthis is some test text.");
-			text_edit->select(1, 0, 1, 4);
-			text_edit->set_caret_line(1);
-			text_edit->set_caret_column(4);
-
-			text_edit->add_caret(3, 4);
-			text_edit->select(3, 0, 3, 4, 1);
-			CHECK(text_edit->get_caret_count() == 2);
-
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
-			SIGNAL_DISCARD("caret_changed");
-
-			// For the second caret.
-			Array args2;
-			args2.push_back(3);
-			args2.push_back(3);
-			lines_edited_args.push_front(args2);
 
-			// With selection should be a normal backspace.
-			((Array)lines_edited_args[1])[0] = 1;
-			((Array)lines_edited_args[1])[1] = 1;
+			// Remove selected text when there are selections.
+			text_edit->select(1, 0, 1, 4);
+			text_edit->add_caret(3, 4);
+			text_edit->select(3, 5, 3, 2, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(3, 3), build_array(1, 1));
 
 			SEND_GUI_ACTION("ui_text_backspace");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == "\n is some test text.\n\n is some test text.");
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == "\n is some test text.\n\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 3);
+			CHECK(text_edit->get_caret_column(1) == 2);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Undo remove selection.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->get_text() == "\nthis is some test text.\n\nthis is some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			CHECK(text_edit->get_selection_origin_line(0) == 1);
+			CHECK(text_edit->get_selection_origin_column(0) == 0);
+			CHECK(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 3);
-			CHECK(text_edit->get_caret_column(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 2);
+			CHECK(text_edit->get_selection_origin_line(1) == 3);
+			CHECK(text_edit->get_selection_origin_column(1) == 5);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
+
+			// Redo remove selection.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "\n is some test text.\n\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 3);
+			CHECK(text_edit->get_caret_column(1) == 2);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			((Array)lines_edited_args[0])[1] = 2;
-			((Array)lines_edited_args[1])[1] = 0;
+			// Remove the newline when at start of line.
+			text_edit->set_caret_column(0, false, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(3, 2), build_array(1, 0));
 
-			// Start of line should also be a normal backspace.
 			SEND_GUI_ACTION("ui_text_backspace");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " is some test text.\n is some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == " is some test text.\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Undo remove newline.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "\n is some test text.\n\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 3);
+			CHECK(text_edit->get_caret_column(1) == 0);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
+
+			// Redo remove newline.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == " is some test text.\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 0);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Does not work if not editable.
 			text_edit->set_caret_column(text_edit->get_line(0).length());
-			text_edit->set_caret_column(text_edit->get_line(1).length(), false, 1);
+			text_edit->set_caret_column(15, false, 1);
 			MessageQueue::get_singleton()->flush();
-
-			SIGNAL_DISCARD("text_set");
-			SIGNAL_DISCARD("text_changed");
-			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
 			text_edit->set_editable(false);
 			SEND_GUI_ACTION("ui_text_backspace");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " is some test text.\n is some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == text_edit->get_line(0).length());
+			CHECK(text_edit->get_text() == " is some test text.\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
-			CHECK(text_edit->get_caret_line(1) == 1);
-			CHECK(text_edit->get_caret_column(1) == text_edit->get_line(1).length());
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == text_edit->get_line(0).length());
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 15);
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			text_edit->set_editable(true);
 
-			((Array)lines_edited_args[0])[0] = 1;
-			((Array)lines_edited_args[0])[1] = 1;
-			((Array)lines_edited_args[1])[0] = 0;
+			// FIXME: Remove after GH-77101 is fixed.
+			text_edit->start_action(TextEdit::ACTION_NONE);
+
+			// Backspace removes character to the left.
+			lines_edited_args = build_array(build_array(1, 1), build_array(0, 0));
 
 			SEND_GUI_ACTION("ui_text_backspace");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " is some test text\n is some test text");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 18);
+			CHECK(text_edit->get_text() == " is some test text\nthis some testtext.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 18);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 14);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Backspace another character without changing caret.
+			SEND_GUI_ACTION("ui_text_backspace");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_text() == " is some test tex\nthis some testext.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 17);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 13);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Undo both backspaces.
+			lines_edited_args = build_array(build_array(1, 1), build_array(0, 0), build_array(1, 1), build_array(0, 0));
+
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == " is some test text.\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 19);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
-			CHECK(text_edit->get_caret_column(1) == 18);
+			CHECK(text_edit->get_caret_column(1) == 15);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
+
+			// Redo both backspaces.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == " is some test tex\nthis some testext.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 17);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 13);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			// Select the entire text, from right to left
-			text_edit->select(0, 18, 0, 0);
+			// Backspace with multiple carets that will overlap.
+			text_edit->remove_secondary_carets();
 			text_edit->set_caret_line(0);
-			text_edit->set_caret_column(0);
-
-			text_edit->select(1, 18, 1, 0, 1);
-			text_edit->set_caret_line(1, false, true, 0, 1);
-			text_edit->set_caret_column(0, false, 1);
+			text_edit->set_caret_column(8);
+			text_edit->add_caret(0, 7);
+			text_edit->add_caret(0, 9);
 			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 0), build_array(0, 0));
 
-			SIGNAL_DISCARD("text_set");
-			SIGNAL_DISCARD("text_changed");
-			SIGNAL_DISCARD("lines_edited_from");
+			SEND_GUI_ACTION("ui_text_backspace");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_text() == " is sotest tex\nthis some testext.");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 6);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Select each line of text, from right to left. Remove selection to column 0.
+			text_edit->select(0, text_edit->get_line(0).length(), 0, 0);
+			text_edit->add_caret(1, 0);
+			text_edit->select(1, text_edit->get_line(1).length(), 1, 0, 1);
+			MessageQueue::get_singleton()->flush();
 			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 1), build_array(0, 0));
 
 			SEND_GUI_ACTION("ui_text_backspace");
 			CHECK(text_edit->get_text() == "\n");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == 0);
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Backspace at start of first line does nothing.
+			text_edit->remove_secondary_carets();
+			text_edit->deselect();
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(0);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			SEND_GUI_ACTION("ui_text_backspace");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_text() == "\n");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_caret_line() == 0);
+			CHECK(text_edit->get_caret_column() == 0);
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
 		}
 
 		SUBCASE("[TextEdit] ui_text_delete_all_to_right") {
@@ -2104,101 +4550,138 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			InputMap::get_singleton()->action_add_event("ui_text_delete_all_to_right", tmpevent);
 
 			text_edit->set_text("this is some test text.\nthis is some test text.\n");
-			text_edit->select(0, 0, 0, 4);
-			text_edit->set_caret_line(0);
-			text_edit->set_caret_column(4);
-
-			text_edit->add_caret(1, 4);
-			text_edit->select(1, 0, 1, 4, 1);
-			CHECK(text_edit->get_caret_count() == 2);
-
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
-			SIGNAL_DISCARD("caret_changed");
 
-			// For the second caret.
-			Array args2;
-			args2.push_back(1);
-			args2.push_back(1);
-			lines_edited_args.push_front(args2);
+			// Remove all text to right of caret.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(18);
+			text_edit->add_caret(0, 16);
+			text_edit->add_caret(0, 20);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0));
 
-			// With selection should be a normal delete.
 			SEND_GUI_ACTION("ui_text_delete_all_to_right");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " is some test text.\n is some test text.\n");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == "this is some tes\nthis is some test text.\n");
+			CHECK(text_edit->get_caret_count() == 1);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 16);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			CHECK(text_edit->get_caret_line(1) == 1);
-			CHECK(text_edit->get_caret_column(1) == 0);
+			// Undo.
+			lines_edited_args = build_array(build_array(0, 0));
+
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "this is some test text.\nthis is some test text.\n");
+			CHECK(text_edit->get_caret_count() == 3);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 18);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 16);
+			CHECK_FALSE(text_edit->has_selection(2));
+			CHECK(text_edit->get_caret_line(2) == 0);
+			CHECK(text_edit->get_caret_column(2) == 20);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			// End of line should not do anything.
-			text_edit->set_caret_column(text_edit->get_line(0).length());
-			text_edit->set_caret_column(text_edit->get_line(1).length(), false, 1);
+			// Redo.
+			text_edit->redo();
 			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "this is some tes\nthis is some test text.\n");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 16);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			SIGNAL_DISCARD("text_set");
-			SIGNAL_DISCARD("text_changed");
-			SIGNAL_DISCARD("lines_edited_from");
+			// Acts as a normal delete with selections.
+			text_edit->select(0, 0, 0, 4);
+			text_edit->add_caret(1, 4);
+			text_edit->select(1, 8, 1, 4, 1);
+			MessageQueue::get_singleton()->flush();
 			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0), build_array(1, 1));
 
 			SEND_GUI_ACTION("ui_text_delete_all_to_right");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " is some test text.\n is some test text.\n");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == text_edit->get_line(0).length());
+			CHECK(text_edit->get_text() == " is some tes\nthissome test text.\n");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 4);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Does nothing when caret is at end of line.
+			text_edit->set_caret_column(text_edit->get_line(0).length());
+			text_edit->set_caret_column(text_edit->get_line(1).length(), false, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			SEND_GUI_ACTION("ui_text_delete_all_to_right");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_text() == " is some tes\nthissome test text.\n");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == text_edit->get_line(0).length());
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == text_edit->get_line(1).length());
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
+			// Does not work if not editable.
 			text_edit->set_caret_column(0);
 			text_edit->set_caret_column(0, false, 1);
 			MessageQueue::get_singleton()->flush();
-
-			SIGNAL_DISCARD("text_set");
-			SIGNAL_DISCARD("text_changed");
-			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
 			text_edit->set_editable(false);
 			SEND_GUI_ACTION("ui_text_delete_all_to_right");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " is some test text.\n is some test text.\n");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == " is some tes\nthissome test text.\n");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == 0);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			text_edit->set_editable(true);
 
+			// Delete entire line.
 			SEND_GUI_ACTION("ui_text_delete_all_to_right");
 			CHECK(text_edit->get_viewport()->is_input_handled());
 			CHECK(text_edit->get_text() == "\n\n");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == 0);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
@@ -2210,302 +4693,589 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			text_edit->set_caret_mid_grapheme_enabled(true);
 			CHECK(text_edit->is_caret_mid_grapheme_enabled());
 
-			text_edit->set_text("this ffi some test text.\n\nthis ffi some test text.\n");
-			text_edit->select(0, 0, 0, 4);
-			text_edit->set_caret_line(0);
-			text_edit->set_caret_column(4);
-
-			text_edit->add_caret(2, 4);
-			text_edit->select(2, 0, 2, 4, 1);
-			CHECK(text_edit->get_caret_count() == 2);
-
+			text_edit->set_text("this is some test text.\n\nthis is some test text.\n");
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
-			// For the second caret.
-			Array args2;
-			args2.push_back(2);
-			args2.push_back(2);
-			lines_edited_args.push_front(args2);
+			// Acts as a normal delete with selections.
+			text_edit->select(0, 8, 0, 15);
+			text_edit->add_caret(2, 6);
+			text_edit->select(2, 10, 2, 6, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0), build_array(2, 2));
 
-			// With selection should be a normal delete.
 			SEND_GUI_ACTION("ui_text_delete_word");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " ffi some test text.\n\n ffi some test text.\n");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == "this is st text.\n\nthis ime test text.\n");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
-			CHECK(text_edit->get_caret_line(1) == 2);
-			CHECK(text_edit->get_caret_column(1) == 0);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 8);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 6);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			// With selection should be a normal delete.
-			((Array)lines_edited_args[0])[0] = 3;
-			((Array)lines_edited_args[1])[0] = 1;
+			// Removes newlines when at end of line.
 			text_edit->set_caret_column(text_edit->get_line(0).length());
 			text_edit->set_caret_column(text_edit->get_line(2).length(), false, 1);
 			MessageQueue::get_singleton()->flush();
-
-			SIGNAL_DISCARD("text_set");
-			SIGNAL_DISCARD("text_changed");
-			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 0), build_array(2, 1));
 
 			SEND_GUI_ACTION("ui_text_delete_word");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " ffi some test text.\n ffi some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == text_edit->get_line(0).length());
-			CHECK_FALSE(text_edit->has_selection());
-
+			CHECK(text_edit->get_text() == "this is st text.\nthis ime test text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == text_edit->get_line(0).length());
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == text_edit->get_line(1).length());
-			CHECK_FALSE(text_edit->has_selection(0));
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			((Array)lines_edited_args[1])[0] = 0;
-			((Array)lines_edited_args[0])[0] = 1;
-			((Array)lines_edited_args[0])[1] = 1;
+			// Does not work if not editable.
 			text_edit->set_caret_column(0);
-			text_edit->set_caret_column(0, false, 1);
+			text_edit->set_caret_column(10, false, 1);
 			MessageQueue::get_singleton()->flush();
-
-			SIGNAL_DISCARD("text_set");
-			SIGNAL_DISCARD("text_changed");
-			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
 			text_edit->set_editable(false);
 			SEND_GUI_ACTION("ui_text_delete_word");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " ffi some test text.\n ffi some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == "this is st text.\nthis ime test text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
-			CHECK(text_edit->get_caret_line(1) == 1);
-			CHECK(text_edit->get_caret_column(1) == 0);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 10);
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			text_edit->set_editable(true);
 
+			// FIXME: Remove after GH-77101 is fixed.
+			text_edit->start_action(TextEdit::ACTION_NONE);
+
+			// Delete to the end of the word right of the caret.
+			lines_edited_args = build_array(build_array(0, 0), build_array(1, 1));
+
 			SEND_GUI_ACTION("ui_text_delete_word");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " some test text.\n some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == " is st text.\nthis ime t text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 10);
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Undo.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "this is st text.\nthis ime test text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
-			CHECK(text_edit->get_caret_column(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 10);
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
+
+			// Redo.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == " is st text.\nthis ime t text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 10);
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
-		}
 
-		SUBCASE("[TextEdit] ui_text_delete") {
-			text_edit->set_caret_mid_grapheme_enabled(true);
-			CHECK(text_edit->is_caret_mid_grapheme_enabled());
+			// Delete one word with multiple carets.
+			text_edit->remove_secondary_carets();
+			text_edit->set_text("onelongword test");
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(6);
+			text_edit->add_caret(0, 9);
+			text_edit->add_caret(0, 3);
+			lines_edited_args = build_array(build_array(0, 0));
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("text_set");
+			SIGNAL_DISCARD("text_changed");
+			SIGNAL_DISCARD("lines_edited_from");
+			SIGNAL_DISCARD("caret_changed");
 
-			text_edit->set_text("this ffi some test text.\nthis ffi some test text.");
-			text_edit->select(0, 0, 0, 4);
+			SEND_GUI_ACTION("ui_text_delete_word");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_text() == "one test");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 3);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Removing newline effectively happens after removing text.
+			text_edit->set_text("test\nlines");
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(2);
+			text_edit->add_caret(0, 4);
+
+			SEND_GUI_ACTION("ui_text_delete_word");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_text() == "telines");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 2);
+			text_edit->remove_secondary_carets();
+
+			// Removing newline effectively happens after removing text, reverse caret order.
+			text_edit->set_text("test\nlines");
 			text_edit->set_caret_line(0);
 			text_edit->set_caret_column(4);
+			text_edit->add_caret(0, 2);
 
-			text_edit->add_caret(1, 4);
-			text_edit->select(1, 0, 1, 4, 1);
-			CHECK(text_edit->get_caret_count() == 2);
+			SEND_GUI_ACTION("ui_text_delete_word");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_text() == "telines");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 2);
+			text_edit->remove_secondary_carets();
+		}
 
+		SUBCASE("[TextEdit] ui_text_delete_word same line") {
+			text_edit->set_text("test longwordtest test");
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
-			// For the second caret.
-			Array args2;
-			args2.push_back(1);
-			args2.push_back(1);
-			lines_edited_args.push_front(args2);
+			// Multiple carets on the same line is handled.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(0);
+			text_edit->add_caret(0, 11);
+			text_edit->add_caret(0, 15);
+			text_edit->add_caret(0, 9);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 0));
 
-			// With selection should be a normal delete.
-			SEND_GUI_ACTION("ui_text_delete");
+			SEND_GUI_ACTION("ui_text_delete_word");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " ffi some test text.\n ffi some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == " long test");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
-			CHECK(text_edit->get_caret_line(1) == 1);
-			CHECK(text_edit->get_caret_column(1) == 0);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 5);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			// With selection should be a normal delete.
-			lines_edited_args.remove_at(0);
-			((Array)lines_edited_args[0])[0] = 1;
-			text_edit->set_caret_column(text_edit->get_line(1).length(), false, 1);
-			text_edit->set_caret_column(text_edit->get_line(0).length());
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 0));
+
+			text_edit->undo();
 			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "test longwordtest test");
+			CHECK(text_edit->get_caret_count() == 4);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 11);
+			CHECK_FALSE(text_edit->has_selection(2));
+			CHECK(text_edit->get_caret_line(2) == 0);
+			CHECK(text_edit->get_caret_column(2) == 15);
+			CHECK_FALSE(text_edit->has_selection(3));
+			CHECK(text_edit->get_caret_line(3) == 0);
+			CHECK(text_edit->get_caret_column(3) == 9);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
 
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == " long test");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 0);
+			CHECK(text_edit->get_caret_column(1) == 5);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+		}
+
+		SUBCASE("[TextEdit] ui_text_delete") {
+			text_edit->set_caret_mid_grapheme_enabled(true);
+			CHECK(text_edit->is_caret_mid_grapheme_enabled());
+
+			text_edit->set_text("this is some test text.\n\nthis is some test text.\n");
+			MessageQueue::get_singleton()->flush();
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
+			// Remove selected text when there are selections.
+			text_edit->select(0, 0, 0, 4);
+			text_edit->add_caret(2, 2);
+			text_edit->select(2, 5, 2, 2, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(0, 0), build_array(2, 2));
+
 			SEND_GUI_ACTION("ui_text_delete");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " ffi some test text. ffi some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 20);
+			CHECK(text_edit->get_text() == " is some test text.\n\nthis some test text.\n");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 2);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			// Caret should be removed due to column preservation.
-			CHECK(text_edit->get_caret_count() == 1);
-
-			// Lets add it back.
-			text_edit->set_caret_column(0);
-			text_edit->add_caret(0, 20);
+			// Undo remove selection.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->get_text() == "this is some test text.\n\nthis is some test text.\n");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 4);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 0);
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 2);
+			CHECK(text_edit->get_selection_origin_line(1) == 2);
+			CHECK(text_edit->get_selection_origin_column(1) == 5);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
 
-			((Array)lines_edited_args[0])[0] = 0;
-			lines_edited_args.push_back(args2);
-			((Array)lines_edited_args[1])[0] = 0;
-			((Array)lines_edited_args[1])[1] = 0;
+			// Redo remove selection.
+			text_edit->redo();
 			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == " is some test text.\n\nthis some test text.\n");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 2);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			SIGNAL_DISCARD("text_set");
-			SIGNAL_DISCARD("text_changed");
-			SIGNAL_DISCARD("lines_edited_from");
+			// Remove newline when at end of line.
+			text_edit->set_caret_column(text_edit->get_line(0).length());
+			text_edit->set_caret_column(text_edit->get_line(2).length(), false, 1);
+			MessageQueue::get_singleton()->flush();
 			SIGNAL_DISCARD("caret_changed");
+			lines_edited_args = build_array(build_array(1, 0), build_array(2, 1));
 
-			text_edit->set_editable(false);
 			SEND_GUI_ACTION("ui_text_delete");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == " ffi some test text. ffi some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == " is some test text.\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 19);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 20);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			CHECK(text_edit->get_caret_line(1) == 0);
+			// Undo remove newline.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == " is some test text.\n\nthis some test text.\n");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 19);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 2);
 			CHECK(text_edit->get_caret_column(1) == 20);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
+
+			// Redo remove newline.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == " is some test text.\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 19);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 20);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Does not work if not editable.
+			text_edit->set_caret_column(0);
+			text_edit->set_caret_column(15, false, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			text_edit->set_editable(false);
+			SEND_GUI_ACTION("ui_text_delete");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_text() == " is some test text.\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 15);
 			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			text_edit->set_editable(true);
 
+			// FIXME: Remove after GH-77101 is fixed.
 			text_edit->start_action(TextEdit::EditAction::ACTION_NONE);
 
+			// Delete removes character to the right.
+			lines_edited_args = build_array(build_array(0, 0), build_array(1, 1));
+
 			SEND_GUI_ACTION("ui_text_delete");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == "ffi some test text.ffi some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_text() == "is some test text.\nthis some test ext.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 15);
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			CHECK(text_edit->get_caret_line(1) == 0);
-			CHECK(text_edit->get_caret_column(1) == 19);
+			// Delete another character without changing caret.
+			SEND_GUI_ACTION("ui_text_delete");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_text() == "s some test text.\nthis some test xt.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 15);
+			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
-			text_edit->start_action(TextEdit::EditAction::ACTION_NONE);
+			// Undo both deletes.
+			lines_edited_args = build_array(build_array(0, 0), build_array(1, 1), build_array(0, 0), build_array(1, 1));
 
-			SEND_GUI_ACTION("ui_text_delete");
-			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_text() == "fi some test text.fi some test text.");
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == " is some test text.\nthis some test text.");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 15);
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
 
-			CHECK(text_edit->get_caret_line(1) == 0);
-			CHECK(text_edit->get_caret_column(1) == 18);
+			// Redo both deletes.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "s some test text.\nthis some test xt.");
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
 			CHECK_FALSE(text_edit->has_selection(1));
-			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			CHECK(text_edit->get_caret_line(1) == 1);
+			CHECK(text_edit->get_caret_column(1) == 15);
+			SIGNAL_CHECK_FALSE("caret_changed");
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Delete at end of last line does nothing.
+			text_edit->remove_secondary_carets();
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(18);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			SEND_GUI_ACTION("ui_text_delete");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_text() == "s some test text.\nthis some test xt.");
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 18);
+			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
 		}
 
 		SUBCASE("[TextEdit] ui_text_caret_word_left") {
 			text_edit->set_text("\nthis is some test text.\nthis is some test text.");
 			text_edit->set_caret_line(1);
-			text_edit->set_caret_column(7);
-
-			text_edit->add_caret(2, 7);
-			CHECK(text_edit->get_caret_count() == 2);
+			text_edit->set_caret_column(15);
+			text_edit->add_caret(2, 10);
+			text_edit->select(1, 10, 1, 15);
+			text_edit->select(2, 15, 2, 10, 1);
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
-			// Shift should select.
+			// Deselect to start of previous word when selection is right to left.
+			// Select to start of next word when selection is left to right.
 #ifdef MACOS_ENABLED
 			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::ALT | KeyModifierMask::SHIFT);
 #else
 			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT);
 #endif
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 5);
-			CHECK(text_edit->get_selected_text(0) == "is");
+			CHECK(text_edit->get_caret_count() == 2);
+
 			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "me ");
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 13);
+			CHECK(text_edit->get_selection_origin_line(0) == 1);
+			CHECK(text_edit->get_selection_origin_column(0) == 10);
+			CHECK(text_edit->is_caret_after_selection_origin(0));
 
-			CHECK(text_edit->get_caret_line(1) == 2);
-			CHECK(text_edit->get_caret_column(1) == 5);
-			CHECK(text_edit->get_selected_text(1) == "is");
 			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_selected_text(1) == "some te");
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 8);
+			CHECK(text_edit->get_selection_origin_line(1) == 2);
+			CHECK(text_edit->get_selection_origin_column(1) == 15);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(1));
 
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// Should still move caret with selection.
-			SEND_GUI_ACTION("ui_text_caret_word_left");
+			// Select to start of word with shift.
+			text_edit->deselect();
+			text_edit->set_caret_column(7);
+			text_edit->set_caret_column(16, false, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+#ifdef MACOS_ENABLED
+			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::ALT | KeyModifierMask::SHIFT);
+#else
+			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT);
+#endif
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 0);
-			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_count() == 2);
 
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "is");
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 5);
+			CHECK(text_edit->get_selection_origin_line(0) == 1);
+			CHECK(text_edit->get_selection_origin_column(0) == 7);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(0));
+
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_selected_text(1) == "tes");
 			CHECK(text_edit->get_caret_line(1) == 2);
-			CHECK(text_edit->get_caret_column(1) == 0);
-			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_column(1) == 13);
+			CHECK(text_edit->get_selection_origin_line(1) == 2);
+			CHECK(text_edit->get_selection_origin_column(1) == 16);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(1));
 
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// Normal word left.
+			// Deselect and move caret to start of next word without shift.
 			SEND_GUI_ACTION("ui_text_caret_word_left");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 8);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
 
+			// Moves to end of previous line when at start of line. Does nothing at start of text.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(0);
+			text_edit->set_caret_column(0, false, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			SEND_GUI_ACTION("ui_text_caret_word_left");
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == 23);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
@@ -2515,249 +5285,417 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			text_edit->set_text("\nthis is some test text.\nthis is some test text.");
 			text_edit->set_caret_line(1);
 			text_edit->set_caret_column(7);
-			text_edit->select(1, 2, 1, 7);
-
-			text_edit->add_caret(2, 7);
-			text_edit->select(2, 2, 2, 7, 1);
-			CHECK(text_edit->get_caret_count() == 2);
-
+			text_edit->select(1, 3, 1, 7);
+			text_edit->add_caret(2, 3);
+			text_edit->select(2, 7, 2, 3, 1);
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
-			// Normal left should deselect and place at selection start.
-			SEND_GUI_ACTION("ui_text_caret_left");
+			// Remove one character from selection when selection is left to right.
+			// Add one character to selection when selection is right to left.
+			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT);
 			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "s i");
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 6);
+			CHECK(text_edit->get_selection_origin_line(0) == 1);
+			CHECK(text_edit->get_selection_origin_column(0) == 3);
+			CHECK(text_edit->is_caret_after_selection_origin(0));
 
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 2);
-			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_selected_text(1) == "is is");
 			CHECK(text_edit->get_caret_line(1) == 2);
 			CHECK(text_edit->get_caret_column(1) == 2);
-			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_selection_origin_line(1) == 2);
+			CHECK(text_edit->get_selection_origin_column(1) == 7);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(1));
 
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// With shift should select.
-			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT);
+			// Deselect and put caret at selection start without shift.
+			SEND_GUI_ACTION("ui_text_caret_left");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 1);
-			CHECK(text_edit->get_selected_text(0) == "h");
-			CHECK(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 3);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 2);
-			CHECK(text_edit->get_caret_column(1) == 1);
-			CHECK(text_edit->get_selected_text(1) == "h");
-			CHECK(text_edit->has_selection(1));
-
+			CHECK(text_edit->get_caret_column(1) == 2);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// All ready at select left, should only deselect.
+			// Move caret one character to the left.
 			SEND_GUI_ACTION("ui_text_caret_left");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 1);
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 2);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 2);
 			CHECK(text_edit->get_caret_column(1) == 1);
-			CHECK_FALSE(text_edit->has_selection(1));
-
-			SIGNAL_CHECK_FALSE("caret_changed");
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// Normal left.
-			SEND_GUI_ACTION("ui_text_caret_left");
+			// Select one character to the left with shift and no existing selection.
+			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT);
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 0);
-			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "h");
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 1);
+			CHECK(text_edit->get_selection_origin_line(0) == 1);
+			CHECK(text_edit->get_selection_origin_column(0) == 2);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(0));
 
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_selected_text(1) == "t");
 			CHECK(text_edit->get_caret_line(1) == 2);
 			CHECK(text_edit->get_caret_column(1) == 0);
-			CHECK_FALSE(text_edit->has_selection());
+			CHECK(text_edit->get_selection_origin_line(1) == 2);
+			CHECK(text_edit->get_selection_origin_column(1) == 1);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(1));
+
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// Left at col 0 should go up a line.
+			// Moves to end of previous line when at start of line. Does nothing at start of text.
+			text_edit->deselect();
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(0);
+			text_edit->set_caret_column(0, false, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
 			SEND_GUI_ACTION("ui_text_caret_left");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 1);
 			CHECK(text_edit->get_caret_column(1) == 23);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
-		}
 
-		SUBCASE("[TextEdit] ui_text_caret_word_right") {
-			text_edit->set_text("this is some test text\n\nthis is some test text\n");
-			text_edit->set_caret_line(0);
-			text_edit->set_caret_column(13);
+			// Selects to end of previous line when at start of line.
+			text_edit->remove_secondary_carets();
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(0);
+			text_edit->select(1, 1, 1, 0);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
 
-			text_edit->add_caret(2, 13);
-			CHECK(text_edit->get_caret_count() == 2);
+			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT);
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "\nt");
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK(text_edit->get_selection_origin_line(0) == 1);
+			CHECK(text_edit->get_selection_origin_column(0) == 1);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(0));
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
 
+			// Merge selections when they overlap.
+			text_edit->set_caret_line(1);
+			text_edit->set_caret_column(4);
+			text_edit->select(1, 6, 1, 4);
+			text_edit->add_caret(1, 8);
+			text_edit->select(1, 8, 1, 6, 1);
 			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			CHECK(text_edit->get_caret_count() == 2);
 
+			SEND_GUI_KEY_EVENT(Key::LEFT | KeyModifierMask::SHIFT);
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "s is ");
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 3);
+			CHECK(text_edit->get_selection_origin_line(0) == 1);
+			CHECK(text_edit->get_selection_origin_column(0) == 8);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(0));
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+		}
+
+		SUBCASE("[TextEdit] ui_text_caret_word_right") {
+			text_edit->set_text("this is some test text\n\nthis is some test text");
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(15);
+			text_edit->add_caret(2, 10);
+			text_edit->select(0, 10, 0, 15);
+			text_edit->select(2, 15, 2, 10, 1);
+			MessageQueue::get_singleton()->flush();
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
-			// Shift should select.
+			// Select to end of next word when selection is right to left.
+			// Deselect to end of previous word when selection is left to right.
 #ifdef MACOS_ENABLED
 			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::ALT | KeyModifierMask::SHIFT);
 #else
 			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT);
 #endif
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 17);
-			CHECK(text_edit->get_selected_text(0) == "test");
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "me test");
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 17);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 10);
+			CHECK(text_edit->is_caret_after_selection_origin(0));
 
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_selected_text(1) == " te");
 			CHECK(text_edit->get_caret_line(1) == 2);
-			CHECK(text_edit->get_caret_column(1) == 17);
-			CHECK(text_edit->get_selected_text(1) == "test");
+			CHECK(text_edit->get_caret_column(1) == 12);
+			CHECK(text_edit->get_selection_origin_line(1) == 2);
+			CHECK(text_edit->get_selection_origin_column(1) == 15);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(1));
+
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
+
+			// Select to end of word with shift.
+			text_edit->deselect();
+			text_edit->set_caret_column(13);
+			text_edit->set_caret_column(15, false, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+#ifdef MACOS_ENABLED
+			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::ALT | KeyModifierMask::SHIFT);
+#else
+			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::CMD_OR_CTRL | KeyModifierMask::SHIFT);
+#endif
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "test");
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 17);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 13);
+			CHECK(text_edit->is_caret_after_selection_origin(0));
+
 			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_selected_text(1) == "st");
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 17);
+			CHECK(text_edit->get_selection_origin_line(1) == 2);
+			CHECK(text_edit->get_selection_origin_column(1) == 15);
+			CHECK(text_edit->is_caret_after_selection_origin(1));
 
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// Should still move caret with selection.
+			// Deselect and move caret to end of next word without shift.
 			SEND_GUI_ACTION("ui_text_caret_word_right");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 22);
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 22);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 2);
 			CHECK(text_edit->get_caret_column(1) == 22);
-			CHECK_FALSE(text_edit->has_selection(1));
-
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// Normal word right.
+			// Moves to start of next line when at end of line. Does nothing at end of text.
 			SEND_GUI_ACTION("ui_text_caret_word_right");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 0);
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
-			CHECK(text_edit->get_caret_line(1) == 3);
-			CHECK(text_edit->get_caret_column(1) == 0);
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
 			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 22);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 		}
 
 		SUBCASE("[TextEdit] ui_text_caret_right") {
-			text_edit->set_text("this is some test text\n\nthis is some test text\n");
+			text_edit->set_text("this is some test text\n\nthis is some test text");
 			text_edit->set_caret_line(0);
-			text_edit->set_caret_column(16);
-			text_edit->select(0, 16, 0, 20);
-
-			text_edit->add_caret(2, 16);
-			text_edit->select(2, 16, 2, 20, 1);
-			CHECK(text_edit->get_caret_count() == 2);
-
+			text_edit->set_caret_column(19);
+			text_edit->select(0, 15, 0, 19);
+			text_edit->add_caret(2, 15);
+			text_edit->select(2, 19, 2, 15, 1);
 			MessageQueue::get_singleton()->flush();
-
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
-			// Normal right should deselect and place at selection start.
-			SEND_GUI_ACTION("ui_text_caret_right");
+			// Remove one character from selection when selection is right to left.
+			// Add one character to selection when selection is left to right.
+			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::SHIFT);
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 20);
-			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "st te");
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 20);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 15);
+			CHECK(text_edit->is_caret_after_selection_origin(0));
 
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_selected_text(1) == "t t");
 			CHECK(text_edit->get_caret_line(1) == 2);
-			CHECK(text_edit->get_caret_column(1) == 20);
-			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_column(1) == 16);
+			CHECK(text_edit->get_selection_origin_line(1) == 2);
+			CHECK(text_edit->get_selection_origin_column(1) == 19);
+			CHECK_FALSE(text_edit->is_caret_after_selection_origin(1));
 
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// With shift should select.
-			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::SHIFT);
+			// Deselect and put caret at selection end without shift.
+			SEND_GUI_ACTION("ui_text_caret_right");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 21);
-			CHECK(text_edit->get_selected_text(0) == "x");
-			CHECK(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 20);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 2);
-			CHECK(text_edit->get_caret_column(1) == 21);
-			CHECK(text_edit->get_selected_text(1) == "x");
-			CHECK(text_edit->has_selection(1));
-
+			CHECK(text_edit->get_caret_column(1) == 19);
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// All ready at select right, should only deselect.
+			// Move caret one character to the right.
 			SEND_GUI_ACTION("ui_text_caret_right");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 21);
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 21);
+			CHECK_FALSE(text_edit->has_selection(1));
+			CHECK(text_edit->get_caret_line(1) == 2);
+			CHECK(text_edit->get_caret_column(1) == 20);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
 
+			// Select one character to the right with shift and no existing selection.
+			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::SHIFT);
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_caret_count() == 2);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "t");
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 22);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 21);
+			CHECK(text_edit->is_caret_after_selection_origin(0));
+
+			CHECK(text_edit->has_selection(1));
+			CHECK(text_edit->get_selected_text(1) == "x");
 			CHECK(text_edit->get_caret_line(1) == 2);
 			CHECK(text_edit->get_caret_column(1) == 21);
-			CHECK_FALSE(text_edit->has_selection(1));
-			SIGNAL_CHECK_FALSE("caret_changed");
+			CHECK(text_edit->get_selection_origin_line(1) == 2);
+			CHECK(text_edit->get_selection_origin_column(1) == 20);
+			CHECK(text_edit->is_caret_after_selection_origin(1));
+
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// Normal right.
+			// Moves to start of next line when at end of line. Does nothing at end of text.
+			text_edit->deselect();
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(22);
+			text_edit->set_caret_column(22, false, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
 			SEND_GUI_ACTION("ui_text_caret_right");
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 0);
-			CHECK(text_edit->get_caret_column() == 22);
+			CHECK(text_edit->get_caret_count() == 2);
 			CHECK_FALSE(text_edit->has_selection(0));
-
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK_FALSE(text_edit->has_selection(1));
 			CHECK(text_edit->get_caret_line(1) == 2);
 			CHECK(text_edit->get_caret_column(1) == 22);
-			CHECK_FALSE(text_edit->has_selection(1));
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			// Right at end col should go down a line.
-			SEND_GUI_ACTION("ui_text_caret_right");
+			// Selects to start of next line when at end of line.
+			text_edit->remove_secondary_carets();
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(22);
+			text_edit->select(0, 21, 0, 22);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+
+			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::SHIFT);
 			CHECK(text_edit->get_viewport()->is_input_handled());
-			CHECK(text_edit->get_caret_line() == 1);
-			CHECK(text_edit->get_caret_column() == 0);
-			CHECK_FALSE(text_edit->has_selection(0));
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == "t\n");
+			CHECK(text_edit->get_caret_line(0) == 1);
+			CHECK(text_edit->get_caret_column(0) == 0);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 21);
+			CHECK(text_edit->is_caret_after_selection_origin(0));
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK_FALSE("text_changed");
+			SIGNAL_CHECK_FALSE("lines_edited_from");
 
-			CHECK(text_edit->get_caret_line(1) == 3);
-			CHECK(text_edit->get_caret_column(1) == 0);
-			CHECK_FALSE(text_edit->has_selection(1));
+			// Merge selections when they overlap.
+			text_edit->set_caret_line(0);
+			text_edit->set_caret_column(4);
+			text_edit->select(0, 4, 0, 6);
+			text_edit->add_caret(0, 8);
+			text_edit->select(0, 6, 0, 8, 1);
+			MessageQueue::get_singleton()->flush();
+			SIGNAL_DISCARD("caret_changed");
+			CHECK(text_edit->get_caret_count() == 2);
+
+			SEND_GUI_KEY_EVENT(Key::RIGHT | KeyModifierMask::SHIFT);
+			CHECK(text_edit->get_viewport()->is_input_handled());
+			CHECK(text_edit->get_caret_count() == 1);
+			CHECK(text_edit->has_selection(0));
+			CHECK(text_edit->get_selected_text(0) == " is s");
+			CHECK(text_edit->get_caret_line(0) == 0);
+			CHECK(text_edit->get_caret_column(0) == 9);
+			CHECK(text_edit->get_selection_origin_line(0) == 0);
+			CHECK(text_edit->get_selection_origin_column(0) == 4);
+			CHECK(text_edit->is_caret_after_selection_origin(0));
 			SIGNAL_CHECK("caret_changed", empty_signal_args);
 			SIGNAL_CHECK_FALSE("text_changed");
 			SIGNAL_CHECK_FALSE("lines_edited_from");
@@ -2775,7 +5713,6 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			CHECK(text_edit->get_caret_count() == 2);
 
 			MessageQueue::get_singleton()->flush();
-
 			CHECK(text_edit->is_line_wrapped(0));
 			SIGNAL_DISCARD("text_set");
 			SIGNAL_DISCARD("text_changed");
@@ -3156,11 +6093,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_DISCARD("lines_edited_from");
 			SIGNAL_DISCARD("caret_changed");
 
-			// For the second caret.
-			Array args2;
-			args2.push_back(1);
-			args2.push_back(1);
-			lines_edited_args.push_front(args2);
+			lines_edited_args = build_array(build_array(0, 0), build_array(1, 1));
 
 			SEND_GUI_KEY_EVENT(Key::A);
 			CHECK(text_edit->get_viewport()->is_input_handled());
@@ -3171,6 +6104,27 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK("text_changed", empty_signal_args);
 			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
 
+			// Undo reverts both carets.
+			text_edit->undo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "a\na");
+			CHECK(text_edit->get_caret_column() == 1);
+			CHECK(text_edit->get_caret_column(1) == 1);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", reverse_nested(lines_edited_args));
+
+			// Redo.
+			text_edit->redo();
+			MessageQueue::get_singleton()->flush();
+			CHECK(text_edit->get_text() == "aA\naA");
+			CHECK(text_edit->get_caret_column() == 2);
+			CHECK(text_edit->get_caret_column(1) == 2);
+			SIGNAL_CHECK("caret_changed", empty_signal_args);
+			SIGNAL_CHECK("text_changed", empty_signal_args);
+			SIGNAL_CHECK("lines_edited_from", lines_edited_args);
+
+			// Does not work if not editable.
 			text_edit->set_editable(false);
 			SEND_GUI_KEY_EVENT(Key::A);
 			CHECK_FALSE(text_edit->get_viewport()->is_input_handled()); // Should this be handled?
@@ -3182,8 +6136,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			SIGNAL_CHECK_FALSE("lines_edited_from");
 			text_edit->set_editable(true);
 
-			lines_edited_args.push_back(lines_edited_args[1].duplicate());
-			lines_edited_args.push_front(args2.duplicate());
+			lines_edited_args = build_array(build_array(0, 0), build_array(0, 0), build_array(1, 1), build_array(1, 1));
 
 			text_edit->select(0, 0, 0, 1);
 			text_edit->select(1, 0, 1, 1, 1);
@@ -3220,8 +6173,7 @@ TEST_CASE("[SceneTree][TextEdit] text entry") {
 			text_edit->set_overtype_mode_enabled(false);
 			CHECK_FALSE(text_edit->is_overtype_mode_enabled());
 
-			lines_edited_args.remove_at(0);
-			lines_edited_args.remove_at(1);
+			lines_edited_args = build_array(build_array(0, 0), build_array(1, 1));
 
 			SEND_GUI_KEY_EVENT(Key::TAB);
 			CHECK(text_edit->get_viewport()->is_input_handled());
@@ -3576,6 +6528,11 @@ TEST_CASE("[SceneTree][TextEdit] caret") {
 	text_edit->set_caret_column(4);
 	CHECK(text_edit->get_word_under_caret() == "Lorem");
 
+	text_edit->set_caret_column(1);
+	text_edit->add_caret(0, 15);
+	CHECK(text_edit->get_word_under_caret() == "Lorem\ndolor");
+	text_edit->remove_secondary_carets();
+
 	// Should this work?
 	text_edit->set_caret_column(5);
 	CHECK(text_edit->get_word_under_caret() == "");
@@ -3616,18 +6573,20 @@ TEST_CASE("[SceneTree][TextEdit] multicaret") {
 	SIGNAL_DISCARD("caret_changed");
 
 	SUBCASE("[TextEdit] add remove caret") {
-		// Overlapping
+		// Overlapping.
 		CHECK(text_edit->add_caret(0, 0) == -1);
 		MessageQueue::get_singleton()->flush();
 		SIGNAL_CHECK_FALSE("caret_changed");
 
-		// Selection
-		text_edit->select(0, 0, 2, 4);
+		// Select.
+		text_edit->select(2, 4, 0, 0);
+
+		// Cannot add in selection.
 		CHECK(text_edit->add_caret(0, 0) == -1);
 		CHECK(text_edit->add_caret(2, 4) == -1);
 		CHECK(text_edit->add_caret(1, 2) == -1);
 
-		// Out of bounds
+		// Cannot add when out of bounds.
 		CHECK(text_edit->add_caret(-1, 0) == -1);
 		CHECK(text_edit->add_caret(5, 0) == -1);
 		CHECK(text_edit->add_caret(0, 100) == -1);
@@ -3670,23 +6629,276 @@ TEST_CASE("[SceneTree][TextEdit] multicaret") {
 		ERR_PRINT_ON;
 	}
 
-	SUBCASE("[TextEdit] caret index edit order") {
-		Vector<int> caret_index_get_order;
-		caret_index_get_order.push_back(1);
-		caret_index_get_order.push_back(0);
+	SUBCASE("[TextEdit] sort carets") {
+		Vector<int> sorted_carets = { 0, 1, 2 };
 
-		CHECK(text_edit->add_caret(1, 0));
-		CHECK(text_edit->get_caret_count() == 2);
-		CHECK(text_edit->get_caret_index_edit_order() == caret_index_get_order);
+		// Ascending order.
+		text_edit->remove_secondary_carets();
+		text_edit->add_caret(0, 1);
+		text_edit->add_caret(1, 0);
+		CHECK(text_edit->get_sorted_carets() == sorted_carets);
 
+		// Descending order.
+		sorted_carets = { 2, 1, 0 };
 		text_edit->remove_secondary_carets();
 		text_edit->set_caret_line(1);
-		CHECK(text_edit->add_caret(0, 0));
+		text_edit->add_caret(0, 1);
+		text_edit->add_caret(0, 0);
+		CHECK(text_edit->get_sorted_carets() == sorted_carets);
+
+		// Mixed order.
+		sorted_carets = { 0, 2, 1, 3 };
+		text_edit->remove_secondary_carets();
+		text_edit->set_caret_line(0);
+		text_edit->add_caret(1, 0);
+		text_edit->add_caret(0, 1);
+		text_edit->add_caret(1, 1);
+		CHECK(text_edit->get_sorted_carets() == sorted_carets);
+
+		// Overlapping carets.
+		sorted_carets = { 0, 1, 3, 2 };
+		text_edit->remove_secondary_carets();
+		text_edit->add_caret(0, 1);
+		text_edit->add_caret(1, 2);
+		text_edit->add_caret(0, 2);
+		text_edit->set_caret_column(1, false, 3);
+		CHECK(text_edit->get_sorted_carets() == sorted_carets);
+
+		// Sorted by selection start.
+		sorted_carets = { 1, 0 };
+		text_edit->remove_secondary_carets();
+		text_edit->select(1, 3, 1, 5);
+		text_edit->add_caret(2, 0);
+		text_edit->select(1, 0, 2, 0, 1);
+		CHECK(text_edit->get_sorted_carets() == sorted_carets);
+	}
+
+	SUBCASE("[TextEdit] merge carets") {
+		text_edit->set_text("this is some text\nfor selection");
+		MessageQueue::get_singleton()->flush();
+
+		// Don't merge carets that are not overlapping.
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(4);
+		text_edit->add_caret(0, 6);
+		text_edit->add_caret(1, 6);
+		text_edit->merge_overlapping_carets();
+		CHECK(text_edit->get_caret_count() == 3);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 4);
+		CHECK(text_edit->get_caret_line(1) == 0);
+		CHECK(text_edit->get_caret_column(1) == 6);
+		CHECK(text_edit->get_caret_line(2) == 1);
+		CHECK(text_edit->get_caret_column(2) == 6);
+		text_edit->remove_secondary_carets();
+
+		// Don't merge when in a multicaret edit.
+		text_edit->begin_multicaret_edit();
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(4);
+		text_edit->add_caret(0, 4);
+		text_edit->merge_overlapping_carets();
+		CHECK(text_edit->is_in_mulitcaret_edit());
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_count() == 2);
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 4);
+		CHECK(text_edit->get_caret_line(1) == 0);
+		CHECK(text_edit->get_caret_column(1) == 4);
+
+		// Merge overlapping carets. Merge at the end of the multicaret edit.
+		text_edit->end_multicaret_edit();
+		CHECK_FALSE(text_edit->is_in_mulitcaret_edit());
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_count() == 1);
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 4);
+
+		// Don't merge selections that are not overlapping.
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(4);
+		text_edit->add_caret(0, 2);
+		text_edit->add_caret(1, 4);
+		text_edit->select(0, 4, 1, 2, 0);
+		text_edit->select(0, 2, 0, 3, 1);
+		text_edit->select(1, 4, 1, 8, 2);
+		text_edit->merge_overlapping_carets();
+		CHECK(text_edit->get_caret_count() == 3);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->has_selection(1));
+		CHECK(text_edit->has_selection(2));
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+
+		// Don't merge selections that are only touching.
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(4);
+		text_edit->add_caret(1, 2);
+		text_edit->select(0, 4, 1, 2, 0);
+		text_edit->select(1, 2, 1, 5, 1);
+		text_edit->merge_overlapping_carets();
+		CHECK(text_edit->get_caret_count() == 2);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->has_selection(1));
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+
+		// Merge carets into selection.
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(3);
+		text_edit->add_caret(0, 2);
+		text_edit->add_caret(1, 4);
+		text_edit->add_caret(1, 8);
+		text_edit->add_caret(1, 10);
+		text_edit->select(0, 2, 1, 8, 0);
+		text_edit->merge_overlapping_carets();
 		CHECK(text_edit->get_caret_count() == 2);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_from_line(0) == 0);
+		CHECK(text_edit->get_selection_from_column(0) == 2);
+		CHECK(text_edit->get_selection_to_line(0) == 1);
+		CHECK(text_edit->get_selection_to_column(0) == 8);
+		CHECK(text_edit->is_caret_after_selection_origin(0));
+		CHECK_FALSE(text_edit->has_selection(1));
+		CHECK(text_edit->get_caret_line(1) == 1);
+		CHECK(text_edit->get_caret_column(1) == 10);
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
 
-		caret_index_get_order.write[0] = 0;
-		caret_index_get_order.write[1] = 1;
-		CHECK(text_edit->get_caret_index_edit_order() == caret_index_get_order);
+		// Merge partially overlapping selections.
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(1);
+		text_edit->add_caret(0, 2);
+		text_edit->add_caret(0, 3);
+		text_edit->select(0, 2, 0, 6, 0);
+		text_edit->select(0, 4, 1, 3, 1);
+		text_edit->select(1, 0, 1, 5, 2);
+		text_edit->merge_overlapping_carets();
+		CHECK(text_edit->get_caret_count() == 1);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_from_line(0) == 0);
+		CHECK(text_edit->get_selection_from_column(0) == 2);
+		CHECK(text_edit->get_selection_to_line(0) == 1);
+		CHECK(text_edit->get_selection_to_column(0) == 5);
+		CHECK(text_edit->is_caret_after_selection_origin(0));
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+
+		// Merge smaller overlapping selection into a bigger one.
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(1);
+		text_edit->add_caret(0, 2);
+		text_edit->add_caret(0, 3);
+		text_edit->select(0, 2, 0, 6, 0);
+		text_edit->select(0, 8, 1, 3, 1);
+		text_edit->select(0, 2, 1, 5, 2);
+		text_edit->merge_overlapping_carets();
+		CHECK(text_edit->get_caret_count() == 1);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_from_line(0) == 0);
+		CHECK(text_edit->get_selection_from_column(0) == 2);
+		CHECK(text_edit->get_selection_to_line(0) == 1);
+		CHECK(text_edit->get_selection_to_column(0) == 5);
+		CHECK(text_edit->is_caret_after_selection_origin(0));
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+
+		// Merge equal overlapping selections.
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(1);
+		text_edit->add_caret(0, 2);
+		text_edit->select(0, 2, 1, 6, 0);
+		text_edit->select(0, 2, 1, 6, 1);
+		text_edit->merge_overlapping_carets();
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_from_line(0) == 0);
+		CHECK(text_edit->get_selection_from_column(0) == 2);
+		CHECK(text_edit->get_selection_to_line(0) == 1);
+		CHECK(text_edit->get_selection_to_column(0) == 6);
+		CHECK(text_edit->is_caret_after_selection_origin(0));
+	}
+
+	SUBCASE("[TextEdit] collapse carets") {
+		text_edit->set_text("this is some text\nfor selection");
+
+		// Collapse carets in range, dont affect other carets.
+		text_edit->add_caret(0, 9);
+		text_edit->add_caret(1, 0);
+		text_edit->add_caret(1, 2);
+		text_edit->add_caret(1, 6);
+		text_edit->begin_multicaret_edit();
+
+		text_edit->collapse_carets(0, 8, 1, 2);
+		CHECK(text_edit->get_caret_count() == 5);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 0);
+		CHECK(text_edit->get_caret_line(1) == 0);
+		CHECK(text_edit->get_caret_column(1) == 8);
+		CHECK(text_edit->get_caret_line(2) == 0);
+		CHECK(text_edit->get_caret_column(2) == 8);
+		CHECK(text_edit->get_caret_line(3) == 1);
+		CHECK(text_edit->get_caret_column(3) == 2);
+		CHECK(text_edit->get_caret_line(4) == 1);
+		CHECK(text_edit->get_caret_column(4) == 6);
+		CHECK_FALSE(text_edit->multicaret_edit_ignore_caret(0));
+		CHECK(text_edit->multicaret_edit_ignore_caret(1));
+		CHECK(text_edit->multicaret_edit_ignore_caret(2));
+		CHECK_FALSE(text_edit->multicaret_edit_ignore_caret(3));
+		CHECK_FALSE(text_edit->multicaret_edit_ignore_caret(4));
+
+		// Collapsed carets get merged at the end of the edit.
+		text_edit->end_multicaret_edit();
+		CHECK(text_edit->get_caret_count() == 4);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 0);
+		CHECK(text_edit->get_caret_line(1) == 0);
+		CHECK(text_edit->get_caret_column(1) == 8);
+		CHECK(text_edit->get_caret_line(2) == 1);
+		CHECK(text_edit->get_caret_column(2) == 2);
+		CHECK(text_edit->get_caret_line(3) == 1);
+		CHECK(text_edit->get_caret_column(3) == 6);
+		text_edit->remove_secondary_carets();
+
+		// Collapse inclusive.
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(3);
+		text_edit->add_caret(1, 2);
+		text_edit->collapse_carets(0, 3, 1, 2, true);
+		CHECK(text_edit->get_caret_count() == 1);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_line() == 0);
+		CHECK(text_edit->get_caret_column() == 3);
+		text_edit->remove_secondary_carets();
+
+		// Deselect if selection was encompassed.
+		text_edit->select(0, 5, 0, 7);
+		text_edit->collapse_carets(0, 3, 1, 2);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_line() == 0);
+		CHECK(text_edit->get_caret_column() == 3);
+
+		// Clamp only caret end of selection.
+		text_edit->select(0, 1, 0, 7);
+		text_edit->collapse_carets(0, 3, 1, 2);
+		CHECK(text_edit->has_selection());
+		CHECK(text_edit->get_caret_line() == 0);
+		CHECK(text_edit->get_caret_column() == 3);
+		CHECK(text_edit->get_selection_origin_line() == 0);
+		CHECK(text_edit->get_selection_origin_column() == 1);
+		text_edit->deselect();
+
+		// Clamp only selection origin end of selection.
+		text_edit->select(0, 7, 0, 1);
+		text_edit->collapse_carets(0, 3, 1, 2);
+		CHECK(text_edit->has_selection());
+		CHECK(text_edit->get_caret_line() == 0);
+		CHECK(text_edit->get_caret_column() == 1);
+		CHECK(text_edit->get_selection_origin_line() == 0);
+		CHECK(text_edit->get_selection_origin_column() == 3);
+		text_edit->deselect();
 	}
 
 	SUBCASE("[TextEdit] add caret at carets") {
@@ -3694,36 +6906,320 @@ TEST_CASE("[SceneTree][TextEdit] multicaret") {
 		text_edit->set_caret_line(1);
 		text_edit->set_caret_column(9);
 
+		// Add caret below. Column will clamp.
 		text_edit->add_caret_at_carets(true);
 		CHECK(text_edit->get_caret_count() == 2);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_line(0) == 1);
+		CHECK(text_edit->get_caret_column(0) == 9);
 		CHECK(text_edit->get_caret_line(1) == 2);
 		CHECK(text_edit->get_caret_column(1) == 4);
 
+		// Cannot add below when at last line.
 		text_edit->add_caret_at_carets(true);
 		CHECK(text_edit->get_caret_count() == 2);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_line(0) == 1);
+		CHECK(text_edit->get_caret_column(0) == 9);
+		CHECK(text_edit->get_caret_line(1) == 2);
+		CHECK(text_edit->get_caret_column(1) == 4);
 
+		// Add caret above. Column will clamp.
 		text_edit->add_caret_at_carets(false);
 		CHECK(text_edit->get_caret_count() == 3);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_line(0) == 1);
+		CHECK(text_edit->get_caret_column(0) == 9);
+		CHECK(text_edit->get_caret_line(1) == 2);
+		CHECK(text_edit->get_caret_column(1) == 4);
 		CHECK(text_edit->get_caret_line(2) == 0);
 		CHECK(text_edit->get_caret_column(2) == 7);
 
+		// Cannot add above when at first line.
+		text_edit->add_caret_at_carets(false);
+		CHECK(text_edit->get_caret_count() == 3);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_line(0) == 1);
+		CHECK(text_edit->get_caret_column(0) == 9);
+		CHECK(text_edit->get_caret_line(1) == 2);
+		CHECK(text_edit->get_caret_column(1) == 4);
+		CHECK(text_edit->get_caret_line(2) == 0);
+		CHECK(text_edit->get_caret_column(2) == 7);
+
+		// Cannot add below when at the last line for selection.
+		text_edit->remove_secondary_carets();
+		text_edit->select(2, 1, 2, 4);
+		text_edit->add_caret_at_carets(true);
+		CHECK(text_edit->get_caret_count() == 1);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_origin_line(0) == 2);
+		CHECK(text_edit->get_selection_origin_column(0) == 1);
+		CHECK(text_edit->get_caret_line(0) == 2);
+		CHECK(text_edit->get_caret_column(0) == 4);
+
+		// Cannot add above when at the first line for selection.
+		text_edit->select(0, 1, 0, 4);
+		text_edit->add_caret_at_carets(false);
+		CHECK(text_edit->get_caret_count() == 1);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_origin_line(0) == 0);
+		CHECK(text_edit->get_selection_origin_column(0) == 1);
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 4);
+
+		// Add selection below.
+		text_edit->select(0, 0, 0, 4);
+		text_edit->add_caret_at_carets(true);
+		CHECK(text_edit->get_caret_count() == 2);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_origin_line(0) == 0);
+		CHECK(text_edit->get_selection_origin_column(0) == 0);
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 4);
+		CHECK(text_edit->has_selection(1));
+		CHECK(text_edit->get_selection_origin_line(1) == 1);
+		CHECK(text_edit->get_selection_origin_column(1) == 0);
+		CHECK(text_edit->get_caret_line(1) == 1);
+		CHECK(text_edit->get_caret_column(1) == 3); // In the default font, this is the same position.
+
+		// Add selection below again.
+		text_edit->add_caret_at_carets(true);
+		CHECK(text_edit->get_caret_count() == 3);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_origin_line(0) == 0);
+		CHECK(text_edit->get_selection_origin_column(0) == 0);
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 4);
+		CHECK(text_edit->has_selection(1));
+		CHECK(text_edit->get_selection_origin_line(1) == 1);
+		CHECK(text_edit->get_selection_origin_column(1) == 0);
+		CHECK(text_edit->get_caret_line(1) == 1);
+		CHECK(text_edit->get_caret_column(1) == 3);
+		CHECK(text_edit->has_selection(2));
+		CHECK(text_edit->get_selection_origin_line(2) == 2);
+		CHECK(text_edit->get_selection_origin_column(2) == 0);
+		CHECK(text_edit->get_caret_line(2) == 2);
+		CHECK(text_edit->get_caret_column(2) == 4);
+
+		text_edit->set_text("\tthis is\nsome\n\ttest text");
+		MessageQueue::get_singleton()->flush();
+
+		// Last fit x is preserved when adding below.
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(6);
+		text_edit->add_caret_at_carets(true);
+		text_edit->add_caret_at_carets(true);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_count() == 3);
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 6);
+		CHECK(text_edit->get_caret_line(1) == 1);
+		CHECK(text_edit->get_caret_column(1) == 4);
+		CHECK(text_edit->get_caret_line(2) == 2);
+		CHECK(text_edit->get_caret_column(2) == 6);
+
+		// Last fit x is preserved when adding above.
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+		text_edit->set_caret_line(2);
+		text_edit->set_caret_column(9);
+		text_edit->add_caret_at_carets(false);
+		text_edit->add_caret_at_carets(false);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_count() == 3);
+		CHECK(text_edit->get_caret_line(0) == 2);
+		CHECK(text_edit->get_caret_column(0) == 9);
+		CHECK(text_edit->get_caret_line(1) == 1);
+		CHECK(text_edit->get_caret_column(1) == 4);
+		CHECK(text_edit->get_caret_line(2) == 0);
+		CHECK(text_edit->get_caret_column(2) == 8);
+
+		// Last fit x is preserved when selection adding below.
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+		text_edit->select(0, 8, 0, 5);
+		text_edit->add_caret_at_carets(true);
+		text_edit->add_caret_at_carets(true);
+		CHECK(text_edit->get_caret_count() == 3);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_origin_line(0) == 0);
+		CHECK(text_edit->get_selection_origin_column(0) == 8);
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 5);
+		CHECK_FALSE(text_edit->has_selection(1));
+		CHECK(text_edit->get_caret_line(1) == 1);
+		CHECK(text_edit->get_caret_column(1) == 4);
+		CHECK(text_edit->has_selection(2));
+		CHECK(text_edit->get_selection_origin_line(2) == 2);
+		CHECK(text_edit->get_selection_origin_column(2) == 7);
+		CHECK(text_edit->get_caret_line(2) == 2);
+		CHECK(text_edit->get_caret_column(2) == 5);
+
+		// Last fit x is preserved when selection adding above.
 		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+		text_edit->select(2, 9, 2, 5);
+		text_edit->add_caret_at_carets(false);
+		text_edit->add_caret_at_carets(false);
+		CHECK(text_edit->get_caret_count() == 3);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_origin_line(0) == 2);
+		CHECK(text_edit->get_selection_origin_column(0) == 9);
+		CHECK(text_edit->get_caret_line(0) == 2);
+		CHECK(text_edit->get_caret_column(0) == 5);
+		CHECK_FALSE(text_edit->has_selection(1));
+		CHECK(text_edit->get_caret_line(1) == 1);
+		CHECK(text_edit->get_caret_column(1) == 4);
+		CHECK(text_edit->has_selection(2));
+		CHECK(text_edit->get_selection_origin_line(2) == 0);
+		CHECK(text_edit->get_selection_origin_column(2) == 8);
+		CHECK(text_edit->get_caret_line(2) == 0);
+		CHECK(text_edit->get_caret_column(2) == 5);
+
+		// Selections are merged when they overlap.
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+		text_edit->select(0, 1, 0, 5);
+		text_edit->add_caret(1, 0);
+		text_edit->select(1, 1, 1, 3, 1);
+		text_edit->add_caret_at_carets(true);
+		CHECK(text_edit->get_caret_count() == 3);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_origin_line(0) == 0);
+		CHECK(text_edit->get_selection_origin_column(0) == 1);
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 5);
+		CHECK(text_edit->has_selection(1));
+		CHECK(text_edit->get_selection_origin_line(1) == 1);
+		CHECK(text_edit->get_selection_origin_column(1) == 1);
+		CHECK(text_edit->get_caret_line(1) == 1);
+		CHECK(text_edit->get_caret_column(1) == 4);
+		CHECK(text_edit->has_selection(2));
+		CHECK(text_edit->get_selection_origin_line(2) == 2);
+		CHECK(text_edit->get_selection_origin_column(2) == 0);
+		CHECK(text_edit->get_caret_line(2) == 2);
+		CHECK(text_edit->get_caret_column(2) == 3);
+
+		// Multiline selection.
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(1);
+		text_edit->select(0, 3, 1, 1);
+		text_edit->add_caret_at_carets(true);
+		CHECK(text_edit->get_caret_count() == 2);
+		CHECK(text_edit->has_selection(0));
+		CHECK(text_edit->get_selection_origin_line(0) == 0);
+		CHECK(text_edit->get_selection_origin_column(0) == 3);
+		CHECK(text_edit->get_caret_line(0) == 1);
+		CHECK(text_edit->get_caret_column(0) == 1);
+		CHECK(text_edit->has_selection(1));
+		CHECK(text_edit->get_selection_origin_line(1) == 1);
+		CHECK(text_edit->get_selection_origin_column(1) == 3);
+		CHECK(text_edit->get_caret_line(1) == 2);
+		CHECK(text_edit->get_caret_column(1) == 0);
+
+		text_edit->set_line_wrapping_mode(TextEdit::LineWrappingMode::LINE_WRAPPING_BOUNDARY);
+		text_edit->set_size(Size2(50, 100));
+		// Line wraps: `\t,this, is\nso,me\n\t,test, ,text`.
+		CHECK(text_edit->is_line_wrapped(0));
+		MessageQueue::get_singleton()->flush();
+
+		// Add caret below on next line wrap.
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
 		text_edit->set_caret_line(0);
 		text_edit->set_caret_column(4);
-		text_edit->select(0, 0, 0, 4);
 		text_edit->add_caret_at_carets(true);
+		CHECK_FALSE(text_edit->has_selection());
 		CHECK(text_edit->get_caret_count() == 2);
-		CHECK(text_edit->get_selection_from_line(1) == 1);
-		CHECK(text_edit->get_selection_to_line(1) == 1);
-		CHECK(text_edit->get_selection_from_column(1) == 0);
-		CHECK(text_edit->get_selection_to_column(1) == 3);
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 4);
+		CHECK(text_edit->get_caret_line(1) == 0);
+		CHECK(text_edit->get_caret_column(1) == 8);
 
+		// Add caret below from end of line wrap.
 		text_edit->add_caret_at_carets(true);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_count() == 3);
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 4);
+		CHECK(text_edit->get_caret_line(1) == 0);
+		CHECK(text_edit->get_caret_column(1) == 8);
+		CHECK(text_edit->get_caret_line(2) == 1);
+		CHECK(text_edit->get_caret_column(2) == 1);
+
+		// Add caret below from last line and not last line wrap.
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+		text_edit->set_caret_line(2);
+		text_edit->set_caret_column(5);
+		text_edit->add_caret_at_carets(true);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_count() == 2);
+		CHECK(text_edit->get_caret_line(0) == 2);
+		CHECK(text_edit->get_caret_column(0) == 5);
+		CHECK(text_edit->get_caret_line(1) == 2);
+		CHECK(text_edit->get_caret_column(1) == 10);
+
+		// Cannot add caret below from last line last line wrap.
+		text_edit->add_caret_at_carets(true);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_count() == 2);
+		CHECK(text_edit->get_caret_line(0) == 2);
+		CHECK(text_edit->get_caret_column(0) == 5);
+		CHECK(text_edit->get_caret_line(1) == 2);
+		CHECK(text_edit->get_caret_column(1) == 10);
+
+		// Add caret above from not first line wrap.
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+		text_edit->set_caret_line(1);
+		text_edit->set_caret_column(4);
+		text_edit->add_caret_at_carets(false);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_count() == 2);
+		CHECK(text_edit->get_caret_line(0) == 1);
+		CHECK(text_edit->get_caret_column(0) == 4);
+		CHECK(text_edit->get_caret_line(1) == 1);
+		CHECK(text_edit->get_caret_column(1) == 1);
+
+		// Add caret above from first line wrap.
+		text_edit->add_caret_at_carets(false);
+		CHECK_FALSE(text_edit->has_selection());
 		CHECK(text_edit->get_caret_count() == 3);
-		CHECK(text_edit->get_selection_from_line(2) == 2);
-		CHECK(text_edit->get_selection_to_line(2) == 2);
-		CHECK(text_edit->get_selection_from_column(2) == 0);
-		CHECK(text_edit->get_selection_to_column(2) == 4);
+		CHECK(text_edit->get_caret_line(0) == 1);
+		CHECK(text_edit->get_caret_column(0) == 4);
+		CHECK(text_edit->get_caret_line(1) == 1);
+		CHECK(text_edit->get_caret_column(1) == 1);
+		CHECK(text_edit->get_caret_line(2) == 0);
+		CHECK(text_edit->get_caret_column(2) == 8);
+
+		// Add caret above from first line and not first line wrap.
+		text_edit->add_caret_at_carets(false);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_count() == 4);
+		CHECK(text_edit->get_caret_line(0) == 1);
+		CHECK(text_edit->get_caret_column(0) == 4);
+		CHECK(text_edit->get_caret_line(1) == 1);
+		CHECK(text_edit->get_caret_column(1) == 1);
+		CHECK(text_edit->get_caret_line(2) == 0);
+		CHECK(text_edit->get_caret_column(2) == 8);
+		CHECK(text_edit->get_caret_line(3) == 0);
+		CHECK(text_edit->get_caret_column(3) == 4);
+
+		// Cannot add caret above from first line first line wrap.
+		text_edit->remove_secondary_carets();
+		text_edit->deselect();
+		text_edit->set_caret_line(0);
+		text_edit->set_caret_column(0);
+		text_edit->add_caret_at_carets(false);
+		CHECK_FALSE(text_edit->has_selection());
+		CHECK(text_edit->get_caret_count() == 1);
+		CHECK(text_edit->get_caret_line(0) == 0);
+		CHECK(text_edit->get_caret_column(0) == 0);
 	}
 
 	memdelete(text_edit);
@@ -3992,7 +7488,7 @@ TEST_CASE("[SceneTree][TextEdit] viewport") {
 	CHECK(text_edit->get_last_full_visible_line() == visible_lines - 1);
 	CHECK(text_edit->get_last_full_visible_line_wrap_index() == 0);
 
-	// Wrap
+	// Wrap.
 	text_edit->set_line_wrapping_mode(TextEdit::LineWrappingMode::LINE_WRAPPING_BOUNDARY);
 	MessageQueue::get_singleton()->flush();
 	CHECK(text_edit->get_total_visible_line_count() > total_visible_lines);
@@ -4242,7 +7738,7 @@ TEST_CASE("[SceneTree][TextEdit] viewport") {
 	CHECK(text_edit->get_last_full_visible_line_wrap_index() == 0);
 	CHECK(text_edit->get_caret_wrap_index() == 0);
 
-	// Typing and undo / redo should adjust viewport
+	// Typing and undo / redo should adjust viewport.
 	text_edit->set_caret_line(0);
 	text_edit->set_caret_column(0);
 	text_edit->set_line_as_first_visible(5);