src/vs/editor/browser/services/editorWorkerService.ts/WorkerManager/_checkStopIdleWorker
class WorkerManager:	private _checkStopIdleWorker(): void {
		if (!this._editorWorkerClient) {
			return;
		}

		const timeSinceLastWorkerUsedTime = (new Date()).getTime() - this._lastWorkerUsedTime;
		if (timeSinceLastWorkerUsedTime > STOP_WORKER_DELTA_TIME_MS) {
			this._editorWorkerClient.dispose();
			this._editorWorkerClient = null;
		}
	}