src/vs/platform/contextkey/browser/contextKeyService.ts/AbstractContextKeyService/createScoped
class AbstractContextKeyService:	public createScoped(domNode: IContextKeyServiceTarget): IContextKeyService {
		if (this._isDisposed) {
			throw new Error(`AbstractContextKeyService has been disposed`);
		}
		return new ScopedContextKeyService(this, domNode);
	}