### 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
arr.push_back(idx + 1);
			arr.push_back(selected_items.size());
			ProgressDialog::get_singleton()->task_step("import_theme_items", TTR("Importing items {n}/{n}").format(arr, "{n}"), idx);
		}
		ItemCheckedState cs = E.value;
		ThemeItem ti = E.key;
		if (cs == SELECT_IMPORT_DEFINITION || cs == SELECT_IMPORT_FULL) {
			Variant item_value = Variant();
			if (cs == SELECT_IMPORT_FULL) {
				item_value = base_theme->get_theme_item(ti.data_type, ti.item_name, ti.type_name);
			} else {
				switch (ti.data_type) {
					case Theme::DATA_TYPE_COLOR:
						item_value = Color();
						break;
					case Theme::DATA_TYPE_CONSTANT:
						item_value = 0;
						break;
					case Theme::DATA_TYPE_FONT:
						item_value = Ref<Font>();
						break;
					case Theme::DATA_TYPE_FONT_SIZE:
						item_value = -1;
						break;
					case Theme::DATA_TYPE_ICON:
						item_value = Ref<Texture2D>();
						break;
					case Theme::DATA_TYPE_STYLEBOX:
						item_value = Ref<StyleBox>();
						break;