Function _onContentChanges

src/material/tabs/paginated-tab-header.ts:362–379

* Callback for when the MutationObserver detects that the content has changed.

()

   * Callback for when the MutationObserver detects that the content has changed.
   */
  _onContentChanges() {
    const textContent = this._elementRef.nativeElement.textContent;

    // We need to diff the text content of the header, because the MutationObserver callback
    // will fire even if the text content didn't change which is inefficient and is prone
    // to infinite loops if a poorly constructed expression is passed in (see #14249).
    if (textContent !== this._currentTextContent) {
      this._currentTextContent = textContent || '';

      // The content observer runs outside the `NgZone` by default, which
      // means that we need to bring the callback back in ourselves.
      this._ngZone.run(() => {
        this.updatePagination();
        this._alignInkBarToSelectedTab();
        this._changeDetectorRef.markForCheck();
      });
    }
  }

  /**
   * Updates the view whether pagination should be enabled or not.