[gnome-shell] gdm: fix sensitivity of auth prompt when cancelling early and user list is disabled

[Ray Strode <halfline src gnome org>]

commit 5961f162fa773a5ffa7b99f43eef66affdaf723a
Author: Ray Strode <rstrode redhat com>
Date:   Tue Oct 7 14:30:34 2014 -0400

    gdm: fix sensitivity of auth prompt when cancelling early and user list is disabled
    
    If the user list is disabled and the user clicks cancel quickly enough
    after typing their username, they can get in a state where the
    auth prompt gets stuck in the insensitive state.
    
    This is because the login dialog code makes the prompt insensitive
    while while pam is processing the provided username, but the prompt
    only makes itself sensitive again when it is hidden.
    
    This commit makes it sensitive right before asking for a username again.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=740141

 js/gdm/loginDialog.js |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/js/gdm/loginDialog.js b/js/gdm/loginDialog.js
index 724b28b..a40dc25 100644
--- a/js/gdm/loginDialog.js
+++ b/js/gdm/loginDialog.js
@@ -643,6 +643,8 @@ const LoginDialog = new Lang.Class({
                                                         realmManager.release();
                                                     }));
         this._updateCancelButton();
+
+        this._authPrompt.updateSensitivity(true);
         this._showPrompt();
     },