### 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
ClassDB::bind_method(D_METHOD("_update_type_items"), &ThemeTypeEditor::_update_type_items);
	ClassDB::bind_method(D_METHOD("_pin_leading_stylebox"), &ThemeTypeEditor::_pin_leading_stylebox);
	ClassDB::bind_method(D_METHOD("_unpin_leading_stylebox"), &ThemeTypeEditor::_unpin_leading_stylebox);
	ClassDB::bind_method(D_METHOD("_change_pinned_stylebox"), &ThemeTypeEditor::_change_pinned_stylebox);
}
void ThemeTypeEditor::set_edited_theme(const Ref<Theme> &p_theme) {
	if (edited_theme.is_valid()) {
		edited_theme->disconnect_changed(callable_mp(this, &ThemeTypeEditor::_update_type_list_debounced));
	}
	edited_theme = p_theme;
	if (edited_theme.is_valid()) {
		edited_theme->connect_changed(callable_mp(this, &ThemeTypeEditor::_update_type_list_debounced));
		_update_type_list();
	}
	add_type_dialog->set_edited_theme(edited_theme);
}
void ThemeTypeEditor::select_type(String p_type_name) {