src/vs/workbench/contrib/notebook/browser/services/notebookWorkerServiceImpl.ts/NotebookEditorModelManager/_stopModelSync
class NotebookEditorModelManager:	private _stopModelSync(modelUrl: string): void {
		const toDispose = this._syncedModels[modelUrl];
		delete this._syncedModels[modelUrl];
		delete this._syncedModelsLastUsedTime[modelUrl];
		dispose(toDispose);
	}