in xwayland master and 1.15.99.904, if one quickly and continuously resizes an arora window, by swirling the bottom corner, black rectangles can be seen around the edges and corner. the common area of the various window shapes do not become black. the rectangles appear where the window edge recently moved away from, or should have been drawn. i did not see this happen with xman or weston-terminal. i tested arora in X11 and did not see the black rectangles when resizing.
i also tried resizing weston-editor, which has a white background. it did not show the black rectangles that arora displays when resizing it.
*** This bug has been marked as a duplicate of bug 81281 ***
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