### 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
Ref<Theme> base_theme = ThemeDB::get_singleton()->get_default_theme();
	List<StringName> theme_types;
	edited_theme->get_type_list(&theme_types);
	theme_types.sort_custom<StringName::AlphCompare>();
	bool item_reselected = false;
	edit_type_list->clear();
	TreeItem *list_root = edit_type_list->create_item();
	for (const StringName &E : theme_types) {
		Ref<Texture2D> item_icon;
		if (E == "") {
			item_icon = get_theme_icon(SNAME("NodeDisabled"), SNAME("EditorIcons"));
		} else {
			item_icon = EditorNode::get_singleton()->get_class_icon(E, "NodeDisabled");
		}
		TreeItem *list_item = edit_type_list->create_item(list_root);
		list_item->set_text(0, E);
		list_item->set_icon(0, item_icon);
		list_item->add_button(0, get_theme_icon(SNAME("Remove"), SNAME("EditorIcons")), TYPES_TREE_REMOVE_ITEM, false, TTR("Remove Type"));
		if (E == edited_item_type) {
			list_item->select(0);
			item_reselected = true;
		}
	}