Reduce unnecessary COW on Vector by make writing explicit

This commit makes operator[] on Vector const and adds a write proxy to it.  From
now on writes to Vectors need to happen through the .write proxy. So for
instance:

Vector<int> vec;
vec.push_back(10);
std::cout << vec[0] << std::endl;
vec.write[0] = 20;

Failing to use the .write proxy will cause a compilation error.

In addition COWable datatypes can now embed a CowData pointer to their data.
This means that String, CharString, and VMap no longer use or derive from
Vector.

_ALWAYS_INLINE_ and _FORCE_INLINE_ are now equivalent for debug and non-debug
builds. This is a lot faster for Vector in the editor and while running tests.
The reason why this difference used to exist is because force-inlined methods
used to give a bad debugging experience. After extensive testing with modern
compilers this is no longer the case.

1 files changed, 12 insertions, 12 deletions

diff --git a/scene/gui/text_edit.cpp b/scene/gui/text_edit.cpp
index cccd1bd197..8926c1ec00 100644
--- a/scene/gui/text_edit.cpp
+++ b/scene/gui/text_edit.cpp
@@ -127,13 +127,13 @@ void TextEdit::Text::_update_line_cache(int p_line) const {
 		w += get_char_width(str[i], str[i + 1], w);
 	}
 
-	text[p_line].width_cache = w;
+	text.write[p_line].width_cache = w;
 
-	text[p_line].wrap_amount_cache = -1;
+	text.write[p_line].wrap_amount_cache = -1;
 
 	//update regions
 
-	text[p_line].region_info.clear();
+	text.write[p_line].region_info.clear();
 
 	for (int i = 0; i < len; i++) {
 
@@ -172,7 +172,7 @@ void TextEdit::Text::_update_line_cache(int p_line) const {
 				ColorRegionInfo cri;
 				cri.end = false;
 				cri.region = j;
-				text[p_line].region_info[i] = cri;
+				text.write[p_line].region_info[i] = cri;
 				i += lr - 1;
 
 				break;
@@ -200,7 +200,7 @@ void TextEdit::Text::_update_line_cache(int p_line) const {
 				ColorRegionInfo cri;
 				cri.end = true;
 				cri.region = j;
-				text[p_line].region_info[i] = cri;
+				text.write[p_line].region_info[i] = cri;
 				i += lr - 1;
 
 				break;
@@ -236,7 +236,7 @@ void TextEdit::Text::set_line_wrap_amount(int p_line, int p_wrap_amount) const {
 
 	ERR_FAIL_INDEX(p_line, text.size());
 
-	text[p_line].wrap_amount_cache = p_wrap_amount;
+	text.write[p_line].wrap_amount_cache = p_wrap_amount;
 }
 
 int TextEdit::Text::get_line_wrap_amount(int p_line) const {
@@ -249,14 +249,14 @@ int TextEdit::Text::get_line_wrap_amount(int p_line) const {
 void TextEdit::Text::clear_width_cache() {
 
 	for (int i = 0; i < text.size(); i++) {
-		text[i].width_cache = -1;
+		text.write[i].width_cache = -1;
 	}
 }
 
 void TextEdit::Text::clear_wrap_cache() {
 
 	for (int i = 0; i < text.size(); i++) {
-		text[i].wrap_amount_cache = -1;
+		text.write[i].wrap_amount_cache = -1;
 	}
 }
 
@@ -281,9 +281,9 @@ void TextEdit::Text::set(int p_line, const String &p_text) {
 
 	ERR_FAIL_INDEX(p_line, text.size());
 
-	text[p_line].width_cache = -1;
-	text[p_line].wrap_amount_cache = -1;
-	text[p_line].data = p_text;
+	text.write[p_line].width_cache = -1;
+	text.write[p_line].wrap_amount_cache = -1;
+	text.write[p_line].data = p_text;
 }
 
 void TextEdit::Text::insert(int p_at, const String &p_text) {
@@ -5729,7 +5729,7 @@ void TextEdit::_update_completion_candidates() {
 
 	for (int i = 0; i < completion_strings.size(); i++) {
 		if (single_quote && completion_strings[i].is_quoted()) {
-			completion_strings[i] = completion_strings[i].unquote().quote("'");
+			completion_strings.write[i] = completion_strings[i].unquote().quote("'");
 		}
 
 		if (s == completion_strings[i]) {