src/vs/workbench/services/storage/browser/storageService.ts/BrowserStorageService/updateIsNew
class BrowserStorageService:	private updateIsNew(storage: IStorage): void {
		const firstOpen = storage.getBoolean(IS_NEW_KEY);
		if (firstOpen === undefined) {
			storage.set(IS_NEW_KEY, true);
		} else if (firstOpen) {
			storage.set(IS_NEW_KEY, false);
		}
	}