There were two regressions in revision 1626: dragging rotated pieces would quickly send them towards infinity, and rotating the camera would introduce roll. The attached patch fixes both issues.
It also contains an unrelated change: Inverting the rotation direction when the camera is upside down seemed like a good idea when I implemented, but I quickly removed that in my local checkout as it doesn't behave well when looking (almost) straight down or up. Didn't realize until now that I never sent a patch for it.
patch
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