anchor.diff:    }
   
     @override
  -  Widget build(BuildContext context) => new Scaffold(
  -        appBar: new AppBar(
  -          title: new Text('Plugin example app'),
  +  Widget build(BuildContext context) => Scaffold(
  +        appBar: AppBar(
  +          title: Text('Plugin example app'),
             actions: <Widget>[
  -            new IconButton(onPressed: _addNewItem, icon: new Icon(Icons.add)),
  -            new PopupMenuButton<_Actions>(
  +            IconButton(onPressed: _addNewItem, icon: Icon(Icons.add)),
  +            PopupMenuButton<_Actions>(
                   onSelected: (action) {
                     switch (action) {
                       case _Actions.deleteAll:
  
positive.code:     final all = await _storage.readAll();
      setState(() {
        return _items = all.keys
            .map((key) => new _SecItem(key, all[key]))
            .toList(growable: false);
      });
    }
  
negative.code:   }
  
    String _randomValue() {
      final rand = Random();
      final codeUnits = List.generate(20, (index) {
        return rand.nextInt(26) + 65;
      });
  
      return String.fromCharCodes(codeUnits);
    }
  }
  
  