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