src/vs/workbench/services/themes/browser/productIconThemeData.ts/ProductIconThemeData/createUnloadedTheme
class ProductIconThemeData:	static createUnloadedTheme(id: string): ProductIconThemeData {
		const themeData = new ProductIconThemeData(id, '', '__' + id);
		themeData.isLoaded = false;
		themeData.extensionData = undefined;
		themeData.watch = false;
		return themeData;
	}