anchor.diff:    @Input()
     set preventInteraction(bool preventInteraction) {
       _resolvedOverlayRef.state.captureEvents = preventInteraction != false;
  +  }
  +
  +  @override
  +  void ngAfterViewInit() {
  +    // Propagate CSS classes of the host element to the overview element for
  +    // integration with Angular CSS shimming.
  +    var hostClassName = _element.className;
  +    resolvedOverlayRef.overlayElement.className += ' $hostClassName';
     }
   
     @override
  
positive.code:   preserveWhitespace: true,
    visibility: Visibility.all, // Injected by dialog, et al.
  )
  class ModalComponent implements DeferredContentAware, Modal, OnDestroy {
    final Element _element;
    final Modal _parentModal;
    final GlobalModalStack _stack;
  
negative.code:       overlayRef.dispose();
      } else {
        _resolvedOverlayRef = overlayRef;
        _disposer
          ..addDisposable(_resolvedOverlayRef)
          ..addStreamSubscription(_resolvedOverlayRef.onVisibleChanged
  