src/vs/editor/browser/services/editorWorkerService.ts/EditorModelManager/_checkStopModelSync
class EditorModelManager:	private _checkStopModelSync(): void {
		const currentTime = (new Date()).getTime();

		const toRemove: string[] = [];
		for (const modelUrl in this._syncedModelsLastUsedTime) {
			const elapsedTime = currentTime - this._syncedModelsLastUsedTime[modelUrl];
			if (elapsedTime > STOP_SYNC_MODEL_DELTA_TIME_MS) {
				toRemove.push(modelUrl);
			}
		}

		for (const e of toRemove) {
			this._stopModelSync(e);
		}
	}