anchor.diff:  
   import 'package:observable/observable.dart';
   import 'package:angular_components/model/selection/select.dart';
  -import 'package:angular_components/model/tree/tree_model.dart';
   
   import 'selection_model.dart';
   
  
positive.code:   }
  }
  
  /// Interface for model that can determine if rows represented by tree nodes
  /// are selectable
  abstract class SelectableWithTreeNode {
    /// If set, used by the table instead of getSelectable to determine selectable
    /// rows.
    SelectableGetter<TreeNode> getTreeNodeSelectable;
  }
  
  /// MultiSelection model that supports "All across pages" selection, that marks
  /// user intent to do bulk action on all entries (even those not currently
  /// visible in a given context).
  abstract class TableSelectionModel<T> extends BaseTableSelectionModel<T>
      implements
          SelectableWithComposition<T>,
          MultiSelectionModel<T>,
          SelectableWithTreeNode {
    factory TableSelectionModel(
        {KeyProvider<T> keyProvider,
        SelectableGetter<T> getSelectable,
  
negative.code: 
    @override
    SelectableGetter<T> getSelectable;
  
    @override
    bool supportsSelectAll = true;
  