Fixes the brush roatation missing update. Also switched to cumulative rects method instead of rect-by-rect, as it is faster, and flicker free when working with big brushes. It may makes it harder to diagnose missing refreshes, however.
git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@392 416bcca6-2ee7-4201-b75f-2eb2f807beb1
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