SUMMARY Debian testing. Slide back effect causes issue with stack order, and wrong windows can be selected, menus will be held in background. Sometimes, the window won't even really slide back and stay in front after the animation finished. Starting the desktop without that effect equals no issue. Note: that issue doesn't appear immediately. Is the window focus stack order code correct and always checked? It should be the issue. It didn't happen on Debian stable. Thanks
*** This bug has been marked as a duplicate of bug 455429 ***