This problem is also present in KDE, so it's not a bug exclusive to
gnome-screensaver.  As was said before, this is a problem with the way X
was designed, and the solutions imply either re-designing X (I doubt
there are many people up to such a task) or working around it.

For suspend/hibernate there's the inhibitor locks design doc from
Freedesktop, that could allow adding some hooks and forcing pop-up
windows to close just before suspending:
http://www.freedesktop.org/wiki/Software/systemd/inhibit

It's a different story when trying to manually lock (ctrl-alt-l), since
the keyboard is grabbed by the pop-up, no application receives the lock
combination and no application can then act appropriately.

In any case it's quite a hard bug to fix, that requires a well thought
solution, not a quick hack to fix it.

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https://bugs.launchpad.net/bugs/49579

Title:
  screen doesn't lock when some menu is open

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