Make Script Editor's parser execute sooner if errors are known to exist

doc/classes/EditorSettings.xml

@@ -1292,6 +1292,9 @@
 		<member name="text_editor/completion/idle_parse_delay" type="float" setter="" getter="">
 			The delay in seconds after which the script editor should check for errors when the user stops typing.
 		</member>
+		<member name="text_editor/completion/idle_parse_delay_with_errors_found" type="float" setter="" getter="">
+			The delay used instead of [member text_editor/completion/idle_parse_delay], when the parser has found errors. A lower value should feel more responsive while fixing code, but may cause notable stuttering and increase CPU usage.
+		</member>
 		<member name="text_editor/completion/put_callhint_tooltip_below_current_line" type="bool" setter="" getter="">
 			If [code]true[/code], the code completion tooltip will appear below the current line unless there is no space on screen below the current line. If [code]false[/code], the code completion tooltip will appear above the current line.
 		</member>

editor/code_editor.cpp

@@ -1119,7 +1119,12 @@ void CodeTextEditor::update_editor_settings() {
 	text_editor->set_code_hint_draw_below(EDITOR_GET("text_editor/completion/put_callhint_tooltip_below_current_line"));
 	code_complete_enabled = EDITOR_GET("text_editor/completion/code_complete_enabled");
 	code_complete_timer->set_wait_time(EDITOR_GET("text_editor/completion/code_complete_delay"));
-	idle->set_wait_time(EDITOR_GET("text_editor/completion/idle_parse_delay"));
+	bool first_time = idle_time == 0.0;
+	idle_time = EDITOR_GET("text_editor/completion/idle_parse_delay");
+	idle_time_with_errors = EDITOR_GET("text_editor/completion/idle_parse_delay_with_errors_found");
+	if (first_time) {
+		idle->set_wait_time(idle_time);
+	}
 
 	// Appearance: Guidelines
 	if (EDITOR_GET("text_editor/appearance/guidelines/show_line_length_guidelines")) {
@@ -1624,8 +1629,11 @@ void CodeTextEditor::_notification(int p_what) {
 void CodeTextEditor::set_error_count(int p_error_count) {
 	error_button->set_text(itos(p_error_count));
 	error_button->set_visible(p_error_count > 0);
-	if (!p_error_count) {
+	if (p_error_count > 0) {
 		_set_show_errors_panel(false);
+		idle->set_wait_time(idle_time_with_errors); // Parsing should happen sooner.
+	} else {
+		idle->set_wait_time(idle_time);
 	}
 }
 
@@ -1797,7 +1805,6 @@ CodeTextEditor::CodeTextEditor() {
 	add_child(status_bar);
 	status_bar->set_h_size_flags(SIZE_EXPAND_FILL);
 	status_bar->set_custom_minimum_size(Size2(0, 24 * EDSCALE)); // Adjust for the height of the warning icon.
-
 	idle = memnew(Timer);
 	add_child(idle);
 	idle->set_one_shot(true);

editor/code_editor.h

@@ -174,6 +174,8 @@ class CodeTextEditor : public VBoxContainer {
 
 	Label *info = nullptr;
 	Timer *idle = nullptr;
+	float idle_time = 0.0f;
+	float idle_time_with_errors = 0.0f;
 	bool code_complete_enabled = true;
 	Timer *code_complete_timer = nullptr;
 	int code_complete_timer_line = 0;

editor/editor_settings.cpp

@@ -724,6 +724,7 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 
 	// Completion
 	EDITOR_SETTING(Variant::FLOAT, PROPERTY_HINT_RANGE, "text_editor/completion/idle_parse_delay", 1.5, "0.1,10,0.01")
+	EDITOR_SETTING(Variant::FLOAT, PROPERTY_HINT_RANGE, "text_editor/completion/idle_parse_delay_with_errors_found", 0.5, "0.1,5,0.01")
 	_initial_set("text_editor/completion/auto_brace_complete", true, true);
 	_initial_set("text_editor/completion/code_complete_enabled", true, true);
 	EDITOR_SETTING(Variant::FLOAT, PROPERTY_HINT_RANGE, "text_editor/completion/code_complete_delay", 0.3, "0.01,5,0.01,or_greater")