Note: This bug might be be related to #1655, I don't know. When one resize a window coverd by another one, the content of the window placed under is not refreshed correctly. This shows with all compositing manager I know (xcompmgr, xfwm4 and even the Xserver's automatic compositor. More surprising is that the shadows turn to black as the underlying window is resize, like if the XRenderComposite with operation= PictOpOver was performed on a unrefreshed area. I tried hacking xcompmgr to repaint the whole screen in one sigle loop and refreshing the whole screen, did not make any difference.... I looks like the window named pixmap/content is altered.
Created attachment 1119 [details] How to reproduce the bug
This bug is also fixed in CVS, thanks to the patch attached to this other bug: https://bugs.freedesktop.org/show_bug.cgi?id=2230
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