### Godot version

4.1.1

### System information

linux

### Issue description

[simplescreenrecorder-2023-08-30_15.01.51.webm](https://github.com/godotengine/godot-proposals/assets/71937306/537d92b9-4f98-4fe6-adf4-71297be0471a)

I guess this wasn't the case before since I could save a layout named "2 monitors".

### Steps to reproduce

press space

### Minimal reproduction project

none
_item_add_cbk(p_data_type, p_control);
}
void ThemeTypeEditor::_item_override_cbk(int p_data_type, String p_item_name) {
	EditorUndoRedoManager *ur = EditorUndoRedoManager::get_singleton();
	ur->create_action(TTR("Override Theme Item"));
	switch (p_data_type) {
		case Theme::DATA_TYPE_COLOR: {
			ur->add_do_method(*edited_theme, "set_color", p_item_name, edited_type, ThemeDB::get_singleton()->get_default_theme()->get_color(p_item_name, edited_type));
			ur->add_undo_method(*edited_theme, "clear_color", p_item_name, edited_type);
		} break;
		case Theme::DATA_TYPE_CONSTANT: {
			ur->add_do_method(*edited_theme, "set_constant", p_item_name, edited_type, ThemeDB::get_singleton()->get_default_theme()->get_constant(p_item_name, edited_type));
			ur->add_undo_method(*edited_theme, "clear_constant", p_item_name, edited_type);
		} break;
		case Theme::DATA_TYPE_FONT: {
			ur->add_do_method(*edited_theme, "set_font", p_item_name, edited_type, Ref<Font>());
			ur->add_undo_method(*edited_theme, "clear_font", p_item_name, edited_type);
		} break;
		case Theme::DATA_TYPE_FONT_SIZE: {
			ur->add_do_method(*edited_theme, "set_font_size", p_item_name, edited_type, ThemeDB::get_singleton()->get_default_theme()->get_font_size(p_item_name, edited_type));
			ur->add_undo_method(*edited_theme, "clear_font_size", p_item_name, edited_type);
		} break;
		case Theme::DATA_TYPE_ICON: {
			ur->add_do_method(*edited_theme, "set_icon", p_item_name, edited_type, Ref<Texture2D>());
			ur->add_undo_method(*edited_theme, "clear_icon", p_item_name, edited_type);
		} break;