Fix undo behavior on `EditorSettingsDialog::_update_builtin_action`.

Fixes #100068.

Co-authored-by: Tomek <[email protected]>

editor/editor_settings_dialog.cpp

@@ -314,6 +314,10 @@ void EditorSettingsDialog::_event_config_confirmed() {
 
 void EditorSettingsDialog::_update_builtin_action(const String &p_name, const Array &p_events) {
 	Array old_input_array = EditorSettings::get_singleton()->get_builtin_action_overrides(p_name);
+	if (old_input_array.is_empty()) {
+		List<Ref<InputEvent>> defaults = InputMap::get_singleton()->get_builtins_with_feature_overrides_applied()[current_edited_identifier];
+		old_input_array = _event_list_to_array_helper(defaults);
+	}
 
 	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
 	undo_redo->create_action(vformat(TTR("Edit Built-in Action: %s"), p_name));
@@ -321,11 +325,11 @@ void EditorSettingsDialog::_update_builtin_action(const String &p_name, const Ar
 	undo_redo->add_undo_method(EditorSettings::get_singleton(), "mark_setting_changed", "builtin_action_overrides");
 	undo_redo->add_do_method(EditorSettings::get_singleton(), "set_builtin_action_override", p_name, p_events);
 	undo_redo->add_undo_method(EditorSettings::get_singleton(), "set_builtin_action_override", p_name, old_input_array);
+	undo_redo->add_do_method(this, "_update_shortcuts");
+	undo_redo->add_undo_method(this, "_update_shortcuts");
 	undo_redo->add_do_method(this, "_settings_changed");
 	undo_redo->add_undo_method(this, "_settings_changed");
 	undo_redo->commit_action();
-
-	_update_shortcuts();
 }
 
 void EditorSettingsDialog::_update_shortcut_events(const String &p_path, const Array &p_events) {