Method _removeOpenDialog

src/cdk/dialog/dialog.ts:367–391

* Removes a dialog from the array of open dialogs. * @param dialogRef Dialog to be removed. * @param emitEvent Whether to emit an event if this is the last dialog.

(dialogRef: DialogRef<R, C>, emitEvent: boolean)

   * @param emitEvent Whether to emit an event if this is the last dialog.
   */
  private _removeOpenDialog<R, C>(dialogRef: DialogRef<R, C>, emitEvent: boolean) {
    const index = this.openDialogs.indexOf(dialogRef);

    if (index > -1) {
      (this.openDialogs as DialogRef<R, C>[]).splice(index, 1);

      // If all the dialogs were closed, remove/restore the `aria-hidden`
      // to a the siblings and emit to the `afterAllClosed` stream.
      if (!this.openDialogs.length) {
        this._ariaHiddenElements.forEach((previousValue, element) => {
          if (previousValue) {
            element.setAttribute('aria-hidden', previousValue);
          } else {
            element.removeAttribute('aria-hidden');
          }
        });

        this._ariaHiddenElements.clear();

        if (emitEvent) {
          this._getAfterAllClosed().next();
        }
      }
    }
  }

  /** Hides all of the content that isn't an overlay from assistive technology. */
  private _hideNonDialogContentFromAssistiveTechnology(overlayContainer: HTMLElement) {