anchor.diff:      onLongPress: onLongPress,
       onHighlightChanged: onHighlightChanged,
       containedInkWell: true,
  -    highlightShape: BoxShape.rectangle
  +    highlightShape: BoxShape.rectangle,
     );
   
     @override
  
positive.code:     GestureTapCallback onTap,
      GestureTapCallback onDoubleTap,
      GestureLongPressCallback onLongPress,
      ValueChanged<bool> onHighlightChanged
    }) : super(
      key: key,
      child: child,
  
negative.code:     @required this.label,
      this.tooltip,
      this.numeric: false,
      this.onSort,
    }) : assert(label != null);
  
    /// The column heading.
  