anchor.diff:      _canvas = null;
     }
   
  -  static final Paint _disableAntialias = new Paint()..isAntiAlias = false;
  +  static final Paint _defaultPaint = new Paint();
   
     /// Hints that the painting in the current layer is complex and would benefit
     /// from caching.
  
positive.code:       painter(childContext, offset);
        childContext._stopRecordingIfNeeded();
      } else {
        canvas.saveLayer(bounds.shift(offset), _disableAntialias);
        canvas.clipPath(clipPath.shift(offset));
        painter(this, offset);
        canvas.restore();
  
negative.code:       painter(childContext, offset);
        childContext._stopRecordingIfNeeded();
      } else {
        canvas.saveLayer(offsetBounds, _defaultPaint);
        canvas.clipRRect(offsetClipRRect);
        painter(this, offset);
        canvas.restore();
  