Before this commit the Discrete Canvas Rotation mode would be unable to snap to the original rotation if starting from an angle that was a multiple of 15 (including 0). This was due to the mode trying to ignore snapping to that angle at the start of the action, but ignoring that angle was applied to the whole action. This commit fixes that issue.
- Set starting angle to some interval of 15 and use the discrete rotate mode (you should now be to return to your original angle)
- Set starting angle to a number not divisible by 15 and use the discrete rotate mode (should just behave exactly as before this commit)
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