Public bug reported:

[ Impact ]

If a PAM module returns an error message during authentication (and it's
the last one that the shell allows before resetting) the message is not
presented to the user, but rather the user is sent back to the user
selection page

[ Test case ]

1. On GDM try to login with an user
2. Type the *wrong* user password multiple times
3. After some retries the password field should not accept input anymore
   The error message should be presented to the user
4. After some moments (enough to read the text) the user selection page should
   be presented again

[ Regression potential ]

We had some dead code due to the wrong variable being referenced, so now
sending messages to a PAM module may be slower if a message is being
shown

** Affects: gnome-shell (Ubuntu)
     Importance: Medium
     Assignee: Marco Trevisan (Treviño) (3v1n0)
         Status: Fix Released

** Affects: gnome-shell (Ubuntu Noble)
     Importance: Medium
     Assignee: Marco Trevisan (Treviño) (3v1n0)
         Status: Fix Committed

** Also affects: gnome-shell (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Changed in: gnome-shell (Ubuntu)
       Status: Fix Committed => Fix Released

** Changed in: gnome-shell (Ubuntu Noble)
   Importance: Undecided => Medium

** Changed in: gnome-shell (Ubuntu Noble)
       Status: New => Fix Committed

** Changed in: gnome-shell (Ubuntu Noble)
     Assignee: (unassigned) => Marco Trevisan (Treviño) (3v1n0)

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https://bugs.launchpad.net/bugs/2084289

Title:
  GDM Authentication error messages are not shown to the user

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