anchor.diff:  }
   
   class FontAwesomeGalleryHomeState extends State<FontAwesomeGalleryHome> {
  -  var searchTerm = "";
  -  var isSearching = false;
  +  var _searchTerm = "";
  +  var _isSearching = false;
   
     @override
     Widget build(BuildContext context) {
       return new Scaffold(
  -      appBar: new AppBar(
  -        leading: isSearching
  -            ? new IconButton(
  -                icon: new Icon(FontAwesomeIcons.arrowLeft),
  -                onPressed: () => setState(() {
  -                      isSearching = false;
  -                      searchTerm = "";
  -                    }))
  -            : null,
  -        title: isSearching
  -            ? new TextField(
  -                onChanged: (text) => setState(() => searchTerm = text),
  -                autofocus: true,
  -                style: new TextStyle(fontSize: 18.0),
  -                decoration: new InputDecoration(hideDivider: true),
  -              )
  -            : new Text("Font Awesome Flutter Gallery"),
  -        actions: isSearching
  -            ? null
  -            : [
  -                new IconButton(
  -                    icon: new Icon(FontAwesomeIcons.search),
  -                    onPressed: () {
  -                      ModalRoute.of(context).addLocalHistoryEntry(
  -                          new LocalHistoryEntry(onRemove: () {
  -                        setState(() {
  -                          searchTerm = "";
  -                          isSearching = false;
  -                        });
  -                      }));
  -
  -                      setState(() {
  -                        isSearching = true;
  -                      });
  -                    })
  -              ],
  -      ),
  +      appBar: _isSearching ? _searchBar(context) : _titleBar(),
         body: new GridView.count(
             crossAxisCount:
                 MediaQuery.of(context).orientation == Orientation.portrait
                     ? 2
                     : 3,
  -          children: (icons..sort())
  +          children: icons
                 .where((icon) =>
  -                  searchTerm.isEmpty ||
  -                  icon.title.toLowerCase().startsWith(searchTerm.toLowerCase()))
  +                  _searchTerm.isEmpty ||
  +                  icon.title.toLowerCase().startsWith(_searchTerm.toLowerCase()))
                 .map((icon) => new InkWell(
                       onTap: () {
                         Navigator.push(
  
positive.code:               .toList()),
      );
    }
  }
  
  final List<IconDefinition> icons = <IconDefinition>[
    new IconDefinition(FontAwesomeIcons.glass, "glass"),
    new IconDefinition(FontAwesomeIcons.music, "music"),
    new IconDefinition(FontAwesomeIcons.search, "search"),
  
negative.code:   new IconDefinition(FontAwesomeIcons.superpowers, "superpowers"),
    new IconDefinition(FontAwesomeIcons.wpexplorer, "wpexplorer"),
    new IconDefinition(FontAwesomeIcons.meetup, "meetup"),
  ]..sort());
  
  class IconDefinition implements Comparable {
    final IconData iconData;
  