when disable-user-list=true, cancelling login leaves gdm in unusable state
Submitted by Daniel Kahn Gillmor
Link to original bug (#704284)
Description
This was originally reported in http://bugs.debian.org/683338, and it appears to be true for gdm 3.4.1 (in debian wheezy)
When gdm's greeter has disable-user-list is set to true, if the user enters a username, they are presented with a password prompt, which has a "login" and a "cancel" button.
If they click the "cancel" button, then all user-interactive fields disappear, and there is no way to log into the display manager.
This cripples the ability for normal users to log into the machine, which is a pretty bad outcome.
Version: 3.4.x