Hard to explain :) Resizing a window offscreen with a compositing manager (either the automatic compositor, xcompmgr or xfwm4 compositor) will cause the offscreen part of the content of the window to be altetered. The problem shows mostly with GTK apps, but with tohers too. It doesn't show with Mozilla for example. Simple test to reproduce: 1) Run xcompmgr (any mode, auto, server or client shadows) 2) Move a GTK window partly off screen to the right 3) resize it vertically 4) move it back on screen, the offscreen parts are all black now Hope that all this make sense :)
Created attachment 1118 [details] A PNG image to show the bug This shows how to reproduce the bug
This bug is fixed in CVS, thanks to the patch attached to this other bug: https://bugs.freedesktop.org/show_bug.cgi?id=2230
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.