Revert "app: use FAST filter when painting xfer surface"
This reverts commit 36258a67. This commit was making the rotated canvas rendering quite horrible to the point that I think it would make the canvas rotation feature barely usable. See bug 759287, comments 13 to 18. I think we will need to find other ways to accelerate rendering. Compromise on quality is possible, but I think that in this case, this was more than just a compromise. It was more like completely abandonning quality. We could even see the lines "spiking" while you were rotating! Like your drawing was alive!
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