anchor.diff:  
     bool deselectOnRemove;
   
  -  CountGetter _totalEntitiesCount = () => -1;
  +  CountGetter _totalEntitiesCount = _noCountGetter;
   
     @override
     CountGetter get totalEntitiesCount => _totalEntitiesCount;
  
positive.code:       _totalEntitiesCountController.stream;
  
    @override
    CountGetter entitiesOnPageCount = () => -1;
  
    @override
    IsIndeterminate isIndeterminate;
  
negative.code:   @override
    SelectableGetter<T> getSelectable;
  
    /// Whether or not the concept of "all entities" is applicable to this model
    /// or not.
    ///
    /// Useful for cases such as an unknown number of entities in the model
    /// due to expansion.
    bool supportsSelectAll;
  
    /// If the table supports selection over multiple pages.
    bool supportsMultiplePageSelection;
  
  