### 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
import_items_tree->clear();
	TreeItem *root = import_items_tree->create_item();
	if (base_theme.is_null()) {
		return;
	}
	String filter_text = import_items_filter->get_text();
	List<StringName> types;
	List<StringName> names;
	List<StringName> filtered_names;
	base_theme->get_type_list(&types);
	types.sort_custom<StringName::AlphCompare>();
	int color_amount = 0;
	int constant_amount = 0;
	int font_amount = 0;
	int font_size_amount = 0;
	int icon_amount = 0;
	int stylebox_amount = 0;
	tree_color_items.clear();
	tree_constant_items.clear();
	tree_font_items.clear();
	tree_font_size_items.clear();
	tree_icon_items.clear();
	tree_stylebox_items.clear();
	for (const StringName &E : types) {
		String type_name = (String)E;
		Ref<Texture2D> type_icon;
		if (E == "") {
			type_icon = get_theme_icon(SNAME("NodeDisabled"), SNAME("EditorIcons"));