### 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
edited_type = p_type_name;
	bool type_exists = false;
	for (int i = 0; i < theme_type_list->get_item_count(); i++) {
		String type_name = theme_type_list->get_item_text(i);
		if (type_name == edited_type) {
			theme_type_list->select(i);
			type_exists = true;
			break;
		}
	}
	if (type_exists) {
		_update_type_items();
	} else {
		edited_theme->add_icon_type(edited_type);
		edited_theme->add_stylebox_type(edited_type);
		edited_theme->add_font_type(edited_type);
		edited_theme->add_font_size_type(edited_type);
		edited_theme->add_color_type(edited_type);
		edited_theme->add_constant_type(edited_type);
		_update_type_list();
	}
}
bool ThemeTypeEditor::is_stylebox_pinned(Ref<StyleBox> p_stylebox) {