anchor.diff:    SnapshotMessage snapshotMessage;
   
     AnalyticsOptInDialog analyticsDialog;
  +
  +  final StatusItem defaultAuxiliaryStatus = createLinkStatusItem(
  +    span()..add(span(text: 'DevTools Docs', c: 'optional-700')),
  +    href: 'https://flutter.dev/docs/development/tools/devtools/overview',
  +    title: 'Documentation on using Dart DevTools',
  +  );
   
     void _initDragDrop() {
       window.addEventListener('dragover', (e) => _onDragOver(e), false);
  
positive.code: 
      globalStatus = StatusLine(CoreElement.from(queryId('global-status')));
      pageStatus = StatusLine(CoreElement.from(queryId('page-status')));
      auxiliaryStatus = StatusLine(CoreElement.from(queryId('auxiliary-status')));
  
      globalActions =
          ActionsContainer(CoreElement.from(queryId('global-actions')));
  
negative.code:       showSnapshotMessage();
        mainElement.clear();
        screens.removeWhere((screen) => screen.id == timelineScreenId);
        auxiliaryStatus.defaultStatus = defaultAuxiliaryStatus;
      } else {
        navigateTo((_previous ?? current).id);
      }
  