Fixed shader editor comment highlighting

editor/plugins/shader_editor_plugin.cpp

@@ -172,7 +172,7 @@ void ShaderTextEditor::_load_theme_settings() {
 	const Color comment_color = EDITOR_GET("text_editor/highlighting/comment_color");
 	syntax_highlighter->clear_color_regions();
 	syntax_highlighter->add_color_region("/*", "*/", comment_color, false);
-	syntax_highlighter->add_color_region("//", "", comment_color, false);
+	syntax_highlighter->add_color_region("//", "", comment_color, true);
 }
 
 void ShaderTextEditor::_check_shader_mode() {

editor/plugins/visual_shader_editor_plugin.cpp

@@ -885,7 +885,7 @@ void VisualShaderEditor::_update_graph() {
 			expression_box->add_theme_color_override("font_color", text_color);
 			expression_syntax_highlighter->set_symbol_color(symbol_color);
 			expression_syntax_highlighter->add_color_region("/*", "*/", comment_color, false);
-			expression_syntax_highlighter->add_color_region("//", "", comment_color, false);
+			expression_syntax_highlighter->add_color_region("//", "", comment_color, true);
 
 			expression_box->set_text(expression);
 			expression_box->set_context_menu_enabled(false);
@@ -1752,7 +1752,7 @@ void VisualShaderEditor::_notification(int p_what) {
 			syntax_highlighter->set_symbol_color(symbol_color);
 			syntax_highlighter->clear_color_regions();
 			syntax_highlighter->add_color_region("/*", "*/", comment_color, false);
-			syntax_highlighter->add_color_region("//", "", comment_color, false);
+			syntax_highlighter->add_color_region("//", "", comment_color, true);
 
 			error_text->add_theme_font_override("font", get_theme_font("status_source", "EditorFonts"));
 			error_text->add_theme_color_override("font_color", get_theme_color("error_color", "Editor"));

scene/resources/syntax_highlighter.cpp

@@ -488,7 +488,7 @@ void CodeHighlighter::add_color_region(const String &p_start_key, const String &
 	color_region.color = p_color;
 	color_region.start_key = p_start_key;
 	color_region.end_key = p_end_key;
-	color_region.line_only = p_line_only;
+	color_region.line_only = p_line_only || p_end_key == "";
 	color_regions.push_back(color_region);
 	clear_highlighting_cache();
 }