Add editor highlight for type-safe lines

The line number is hightlighted to indicate that the line contains only
type-safe code.

3 files changed, 21 insertions, 1 deletions

diff --git a/scene/gui/text_edit.cpp b/scene/gui/text_edit.cpp
index 218b5060a1..90cb475a7b 100644
--- a/scene/gui/text_edit.cpp
+++ b/scene/gui/text_edit.cpp
@@ -290,6 +290,7 @@ void TextEdit::Text::insert(int p_at, const String &p_text) {
 
 	Line line;
 	line.marked = false;
+	line.safe = false;
 	line.breakpoint = false;
 	line.hidden = false;
 	line.width_cache = -1;
@@ -972,7 +973,7 @@ void TextEdit::_notification(int p_what) {
 								fc = line_num_padding + fc;
 							}
 
-							cache.font->draw(ci, Point2(cache.style_normal->get_margin(MARGIN_LEFT) + cache.breakpoint_gutter_width + ofs_x, yofs + cache.font->get_ascent()), fc, cache.line_number_color);
+							cache.font->draw(ci, Point2(cache.style_normal->get_margin(MARGIN_LEFT) + cache.breakpoint_gutter_width + ofs_x, yofs + cache.font->get_ascent()), fc, text.is_safe(line) ? cache.safe_line_number_color : cache.line_number_color);
 						}
 					}
 
@@ -4314,6 +4315,7 @@ void TextEdit::_update_caches() {
 	cache.caret_color = get_color("caret_color");
 	cache.caret_background_color = get_color("caret_background_color");
 	cache.line_number_color = get_color("line_number_color");
+	cache.safe_line_number_color = get_color("safe_line_number_color");
 	cache.font_color = get_color("font_color");
 	cache.font_selected_color = get_color("font_selected_color");
 	cache.keyword_color = get_color("keyword_color");
@@ -4885,6 +4887,17 @@ void TextEdit::set_line_as_marked(int p_line, bool p_marked) {
 	update();
 }
 
+void TextEdit::set_line_as_safe(int p_line, bool p_safe) {
+	ERR_FAIL_INDEX(p_line, text.size());
+	text.set_safe(p_line, p_safe);
+	update();
+}
+
+bool TextEdit::is_line_set_as_safe(int p_line) const {
+	ERR_FAIL_INDEX_V(p_line, text.size(), false);
+	return text.is_safe(p_line);
+}
+
 bool TextEdit::is_line_set_as_breakpoint(int p_line) const {
 
 	ERR_FAIL_INDEX_V(p_line, text.size(), false);
diff --git a/scene/gui/text_edit.h b/scene/gui/text_edit.h
index 586f4c8e93..34d69bb508 100644
--- a/scene/gui/text_edit.h
+++ b/scene/gui/text_edit.h
@@ -76,6 +76,7 @@ public:
 			bool marked : 1;
 			bool breakpoint : 1;
 			bool hidden : 1;
+			bool safe : 1;
 			int wrap_amount_cache : 24;
 			Map<int, ColorRegionInfo> region_info;
 			String data;
@@ -106,6 +107,8 @@ public:
 		bool is_breakpoint(int p_line) const { return text[p_line].breakpoint; }
 		void set_hidden(int p_line, bool p_hidden) { text[p_line].hidden = p_hidden; }
 		bool is_hidden(int p_line) const { return text[p_line].hidden; }
+		void set_safe(int p_line, bool p_safe) { text[p_line].safe = p_safe; }
+		bool is_safe(int p_line) const { return text[p_line].safe; }
 		void insert(int p_at, const String &p_text);
 		void remove(int p_at);
 		int size() const { return text.size(); }
@@ -165,6 +168,7 @@ private:
 		Color caret_color;
 		Color caret_background_color;
 		Color line_number_color;
+		Color safe_line_number_color;
 		Color font_color;
 		Color font_selected_color;
 		Color keyword_color;
@@ -472,6 +476,8 @@ public:
 	void set_line_as_marked(int p_line, bool p_marked);
 	void set_line_as_breakpoint(int p_line, bool p_breakpoint);
 	bool is_line_set_as_breakpoint(int p_line) const;
+	void set_line_as_safe(int p_line, bool p_safe);
+	bool is_line_set_as_safe(int p_line) const;
 	void get_breakpoints(List<int> *p_breakpoints) const;
 	Array get_breakpoints_array() const;
 	void remove_breakpoints();
diff --git a/scene/resources/default_theme/default_theme.cpp b/scene/resources/default_theme/default_theme.cpp
index d4432b969f..fe12e2f5f6 100644
--- a/scene/resources/default_theme/default_theme.cpp
+++ b/scene/resources/default_theme/default_theme.cpp
@@ -476,6 +476,7 @@ void fill_default_theme(Ref<Theme> &theme, const Ref<Font> &default_font, const
 	theme->set_color("symbol_color", "TextEdit", control_font_color_hover);
 	theme->set_color("brace_mismatch_color", "TextEdit", Color(1, 0.2, 0.2));
 	theme->set_color("line_number_color", "TextEdit", Color::html("66aaaaaa"));
+	theme->set_color("safe_line_number_color", "TextEdit", Color::html("99aac8aa"));
 	theme->set_color("function_color", "TextEdit", Color::html("66a2ce"));
 	theme->set_color("member_variable_color", "TextEdit", Color::html("e64e59"));
 	theme->set_color("number_color", "TextEdit", Color::html("EB9532"));