src/vs/workbench/services/userDataSync/browser/userDataSyncWorkbenchService.ts/UserDataSyncPreview/discard
class UserDataSyncPreview:	async discard(resource: URI): Promise<void> {
		if (!this.manualSync) {
			throw new Error('Can discard only while syncing manually');
		}
		const syncPreview = await this.manualSync.task.discard(resource);
		this.updatePreview(syncPreview);
	}