[Bug 67919] Re: Xinerama problem with log out and unlock dialogues

[Christof Krüger]

Attached a patch to gnome-screensaver which should fix the issue.
The lock screen window has been overlaid because gnome-screensaver windows listen to x events and raise themselves whenever a MapNotify or ConfigureNotify event arrives in order to keep themselves on the very top.

Events caused by gnome-screensaver itself are ignored of course or there
would be an infinite raising race on xinerama. However the unlock-window
is created by a seperate program: gnome-screensaver-dialog and therefore
gnome-screensaver does not recognize it as "own" window. Therefore, the
other screensaver window raises itself above the other. If this actually
happens depends on the order in which the events are delivered to both
screensaver windows.

The patch does the following: With the current design a screensaver
window can't easily see if another screensaver window is currently
displaying the unlock screen. Thus, the easiest way to handle the
problem is to make the unlocking-window reraise itself even it the x
event came from gnome-screensaver itself. This way, even if another
screensaver window raises itself as a reaction of the unlock screen
appearing, the screensaver window with the unlock screen will notice and
reraise itself.

@Malcolm Parsons:
I cannot reproduce the problem with gksu. Could you please give exact instructions how to reproduce?

** Attachment added: "patch solving the problem with gnome-screensaver"
   http://librarian.launchpad.net/6678618/02_keep_unlock_raised.patch

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Xinerama problem with log out and unlock dialogues
https://launchpad.net/bugs/67919