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