src/vs/workbench/api/browser/mainThreadFileSystem.ts/MainThreadFileSystem/$unwatch
class MainThreadFileSystem:	$unwatch(session: number): void {
		const subscription = this._watches.get(session);
		if (subscription) {
			this._logService.trace(`MainThreadFileSystem#$unwatch(): request to stop watching (session: ${session})`);

			subscription.dispose();
			this._watches.delete(session);
		}
	}