Robert, I investigated this further today, and I'd suggest it should be put on hold for a couple of days. The reason is that MultiTouchTrackballManipulator::handleMultiTouchDrag handles the events inconsistently between trunk and 3.2, and I think both are wrong.
The only natural thing to do is to let the touch-points be in real window coordinates, but then the points are normalized wrongly in handleMultiTouchDrag (in trunk), as it normalizes it wrongly (in my view). I will submit a holistic patch later this week (or next) that handles this so you can see what my thoughts are. - K
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