anchor.diff:        var note = new Note.now(title, nc);
         _noteStorage[note.key] = note;
   
  -      _updateNotesList();
  +      _dirtyNoteList();
   
         return note;
       }
  
positive.code:     filterPropertyChangeRecords(_noteSync, const Symbol('isUpdated'))
        .listen(_onNoteSyncIsUpdated);
  
      _updateNotesList();
    }
  
    //
  
negative.code:   final ReadOnlyObservableList<Note> notes;
  
    String _searchTerm = '';
    bool _noteListDirty = false;
  
    factory AppController(MapSync<Note> noteStorage) {
      var notes = new ObservableList<Note>();
  