Method finally

frontend/src/client/core/CancelablePromise.ts:100–102

(onFinally?: (() => void) | null)

  }

  public finally(onFinally?: (() => void) | null): Promise<T> {
    return this.promise.finally(onFinally)
  }

  public cancel(): void {
    if (this._isResolved || this._isRejected || this._isCancelled) {