Tux Paint's shape rotation is difficult to use on a touch screen (where there's no drag without clicking). The UI should wait for release, which would allow a user to click-and-hold, drag to rotate, and then release to complete the process. (To remain compatible with how we've done it since the beginning, we should not REQUIRE a click to initiate a rotation, and continue allowing dragging to work automatically.)
Ref: Suggestion from François PERRENOUD to tuxpaint-devel list on May 25, 2010.
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