anchor.diff:    /// These CSS classes will be copied into the popup overlay. The classes can
     /// be used to select DOM elements within the overlay when the popup is open.
     @Input()
  -  String popupClass;
  +  set popupClass(String value) {
  +    _popupClass = constructEncapsulatedCss(value, element.classes);
  +  }
  +
  +  String get popupClass => _popupClass;
  +  String _popupClass;
  +
  +  MenuPopupComponent(this.element);
   
     @ViewChild(MenuItemGroupsComponent)
     set menuItemGroups(MenuItemGroupsComponent groups) {
  
positive.code: // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
  // for details. All rights reserved. Use of this source code is governed by a
  // BSD-style license that can be found in the LICENSE file.
  
  import 'package:angular/angular.dart';
  import 'package:angular_components/content/deferred_content.dart';
  
negative.code:     styleUrls: ['menu_popup.scss.css'],
      changeDetection: ChangeDetectionStrategy.OnPush)
  class MenuPopupComponent extends Object with FocusableMixin, MenuPopupWrapper {
    HtmlElement element;
  
    @Input()
    PopupSource popupSource;
  
  