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Rotate / Zoom sometimes translates down one pixel when rotating by 90 degrees

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If I start with a 512x512 white canvas, then rotate it 90 degrees with Rotate/Zoom, the top pixel row is transparent. By marking the edge pixels, I confirmed that the rotated image is translated down one pixel, so the previous left column is lost.


My guess is that the rotation is about the wrong center.


(I say "sometimes" only because I haven't checked every situation.)

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