This can be seen by:
We use selection rects to compute the repaint rect for text. In the above case "Gradient On Stroke" has the top of the 'G' clipped off. Also, if you try and select the text, you'll see that the individual character rects are wrong.
Some of this is due to use of objectBoundingBox() where we should be using repaintRectInLocalCoordinates(), but fixing those does not fix the whole bug.
Fixed in r89233.