Comment 1 for bug 525508

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Alvin Penner (apenner) wrote :

yes, it is incrementing by precisely 22 degrees, not 22.5.
If you set the increment at 22.5 and hit [ 45 times then you will get a perfectly vertical line corresponding to 990 degrees which is a multiple of 22.

similarly, it looks as if 7.5 will show the same or similar behaviour.