Disable multi-window buttons instead of hiding them when support is unavailable

This is more explicit as for why this functionality isn't available
depending on editor settings and current platform.

This also exposes a `EditorInterface.is_multi_window_enabled()` method
so that editor plugins can easily query whether the editor is able and
expected to create multiple windows.

1 files changed, 11 insertions, 8 deletions

diff --git a/editor/editor_dock_manager.cpp b/editor/editor_dock_manager.cpp
index dfe9504706..54789bdef1 100644
--- a/editor/editor_dock_manager.cpp
+++ b/editor/editor_dock_manager.cpp
@@ -702,15 +702,18 @@ EditorDockManager::EditorDockManager() {
 	dock_select->set_v_size_flags(Control::SIZE_EXPAND_FILL);
 	dock_vb->add_child(dock_select);
 
-	if (!SceneTree::get_singleton()->get_root()->is_embedding_subwindows() && !EDITOR_GET("interface/editor/single_window_mode") && EDITOR_GET("interface/multi_window/enable")) {
-		dock_float = memnew(Button);
-		dock_float->set_text(TTR("Make Floating"));
-		dock_float->set_focus_mode(Control::FOCUS_NONE);
-		dock_float->set_h_size_flags(Control::SIZE_SHRINK_CENTER);
-		dock_float->connect("pressed", callable_mp(this, &EditorDockManager::_dock_make_selected_float));
-
-		dock_vb->add_child(dock_float);
+	dock_float = memnew(Button);
+	dock_float->set_text(TTR("Make Floating"));
+	if (!EditorNode::get_singleton()->is_multi_window_enabled()) {
+		dock_float->set_disabled(true);
+		dock_float->set_tooltip_text(EditorNode::get_singleton()->get_multiwindow_support_tooltip_text());
+	} else {
+		dock_float->set_tooltip_text(TTR("Make this dock floating."));
 	}
+	dock_float->set_focus_mode(Control::FOCUS_NONE);
+	dock_float->set_h_size_flags(Control::SIZE_SHRINK_CENTER);
+	dock_float->connect("pressed", callable_mp(this, &EditorDockManager::_dock_make_selected_float));
+	dock_vb->add_child(dock_float);
 
 	dock_select_popup->reset_size();
 }