anchor.diff:  class GalleryHomeState extends State<GalleryHome> {
     static final Key _homeKey = new ValueKey<String>("Gallery Home");
     static final GlobalKey<ScrollableState> _scrollableKey = new GlobalKey<ScrollableState>();
  -  final List<Widget> _listItems = <Widget>[];
   
  -  @override
  -  void initState() {
  -    super.initState();
  -
  +  List<Widget> _galleryListItems() {
  +    final List<Widget> listItems = <Widget>[];
       final ThemeData themeData = Theme.of(context);
       final TextStyle headerStyle = themeData.textTheme.body2.copyWith(color: themeData.accentColor);
       String category;
       for (GalleryItem galleryItem in kAllGalleryItems) {
         if (category != galleryItem.category) {
           if (category != null)
  -          _listItems.add(new Divider());
  -        _listItems.add(
  +          listItems.add(new Divider());
  +        listItems.add(
             new Container(
               height: 48.0,
               padding: const EdgeInsets.only(left: 16.0),
  
positive.code:       body: new Block(
         scrollableKey: _scrollableKey,
         padding: new EdgeInsets.only(top: _kFlexibleSpaceMaxHeight + statusBarHeight),
         children: _listItems
        )
      );
    }
  
negative.code:         );
          category = galleryItem.category;
        }
        listItems.add(galleryItem);
      }
      return listItems;
    }
  
    @override
  