Ensure keyboard grab and unlock dialog exist after monitor removal
gnome-screensaver currently doesn't deal with monitors getting removed properly. If the unlock dialog is on the removed monitor then the unlock dialog and its associated keyboard grab are not moved to an existing monitor when the monitor removal is processed. This means that users can gain access to the locked system by placing the mouse pointer on an external monitor and then disconnect the external monitor. CVE-2010-0414 https://bugzilla.gnome.org/show_bug.cgi?id=609337
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