anchor.diff:    int ts;
   }
   
  +abstract class SelectableItem {
  +  int get index;
  +  void reset();
  +}
  +
   abstract class Pair<T> {
     T orig;
     T copy;
  
positive.code:     $state.loading = true;
      return true;
    }
  }
  
  
negative.code: 
    bool desc;
    List<Pair<T>> list, mainList;
    SelectableItem _selected;
  
    FetchType _fetchType;
    int _fetchTs = 0;
  