anchor.diff:  import 'package:flutter_secure_storage/flutter_secure_storage.dart';
   
   void main() {
  -  runApp(new MaterialApp(home: new ItemsWidget()));
  +  runApp(MaterialApp(home: ItemsWidget()));
   }
   
   class ItemsWidget extends StatefulWidget {
     @override
  -  _ItemsWidgetState createState() => new _ItemsWidgetState();
  +  _ItemsWidgetState createState() => _ItemsWidgetState();
   }
   
   enum _Actions { deleteAll }
   enum _ItemActions { delete, edit }
   
   class _ItemsWidgetState extends State<ItemsWidget> {
  -  final _storage = new FlutterSecureStorage();
  +  final _storage = FlutterSecureStorage();
   
     List<_SecItem> _items = [];
   
  
positive.code:       case _ItemActions.edit:
          final result = await showDialog<String>(
              context: context,
              builder: (context) => new _EditItemWidget(item.value));
          if (result != null) {
            _storage.write(key: item.key, value: result);
            _readAll();
  
negative.code:   }
  
    @override
    Widget build(BuildContext context) => Scaffold(
          appBar: AppBar(
            title: Text('Plugin example app'),
            actions: <Widget>[
              IconButton(onPressed: _addNewItem, icon: Icon(Icons.add)),
              PopupMenuButton<_Actions>(
                  onSelected: (action) {
                    switch (action) {
                      case _Actions.deleteAll:
  