The attached image 'gdm-bouncing-castle.png' shows half-a-dozen
different sizes of the GDM login box during a <10 second period of time.

The was generated from doing:

 * $ while true ; do DISPLAY=:3 sudo recordmydesktop ; done
 * New Session... login
 * Playing the ogv at 1/10 speed in vlc and taking screenshots
 * cropping with mogrify -crop 368x500+456+189
 * manually combining side-by-side in Gimp

The randomness is an artifact of the GDM login and _not_ of the video
recording or screenshoting.

The problem appears to be repeated dynamic updates of the login window
without disabling the dynamic relayout during the update.  (Not wrapped
with  gtk_container_disable_resize() and gtk_container_enable_resize()
(?)).

However container re-layout is not the whole issue as---seen from the
first capture on the left---the dialogue first appears with all buttons
greyed out as disabled and no users in the list.


** Attachment added: "gdm-bouncing-castle.png"
   http://launchpadlibrarian.net/31896742/gdm-bouncing-castle.png

-- 
Constantly resizing GDM login box is disconcerting
https://bugs.launchpad.net/bugs/430207
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