anchor.diff:      }
     }
   
  -  void toggle(inItem) {
  +  void toggle(Element inItem) {
       setItemSelected(inItem, !isSelected(inItem));
     }
   }
  
positive.code: // license that can be found in the LICENSE file.
  
  library spark_widgets.selection;
  
  import 'package:polymer/polymer.dart';
  
  
negative.code:     }
    }
  
    void select(Element inItem) {
      if (multi) {
        toggle(inItem);
      } else if (selection != inItem) {
  