anchor.diff:    //
     // Methods
     //
  +
     Future<NoteContent> openOrCreateNote(String title) {
   
       return _searchTitle(title)
  
positive.code:         });
    }
  
    //
    // Implementations
    //
  
    void _notifyChange(Symbol prop) {
      notifyChange(new PropertyChangeRecord(prop));
    }
  
negative.code:         });
    }
  
    //
    // Implementation
    //
  
    /**
     * Returns null if not fonud
     */
  