anchor.diff:          _lastHighlight = new InkHighlight(
             controller: Material.of(context),
             referenceBox: referenceBox,
  -          color: Theme.of(context).highlightColor,
  +          color: config.highlightColor ?? Theme.of(context).highlightColor,
             shape: config.highlightShape,
             rectCallback: config.getRectCallback(referenceBox),
             onRemoved: () {
  
positive.code:     onLongPress: onLongPress,
      onHighlightChanged: onHighlightChanged,
      containedInkWell: true,
      highlightShape: BoxShape.rectangle
    );
  }
  
negative.code:     GestureTapCallback onTap,
      GestureTapCallback onDoubleTap,
      GestureLongPressCallback onLongPress,
      ValueChanged<bool> onHighlightChanged,
      Color highlightColor,
      Color splashColor,
    }) : super(
      key: key,
      child: child,
  