Thank you for your bug. This dialog is part of the window manager and
having it running with high priority would probably mean run the window
manager this way which would be an ugly hack. If there is an issue
that's a linux scheduler one, it should not let a program hang the
desktop this way.
I have put this against metacity (because another Force Quit related bug
was put there) but I have this problem when running compiz, so I am not
sure that this is where it belongs.
--
Force Quit should be run at a higher priority than normal applications
https://bugs.launchpad.net/bugs/150796
