anchor.diff:      @required this.clearSearchField,
       this.keyEventsToPropagate = const {},
       this.supportClearField = false,
  -    this.closeHandler,
     });
   
     final AutoCompleteSearchControllerMixin controller;
  
positive.code:   }
  }
  
  class _AutoCompleteSearchField extends StatelessWidget {
    const _AutoCompleteSearchField({
      @required this.searchField,
      @required this.controller,
  
negative.code:         : KeyEventResult.handled;
    }
  
    void _highlightDropdownDefault(
      AutoCompleteSearchControllerMixin controller,
      bool directionDown,
    ) {
  