[gnome-shell/gnome-3-0] gdm: ignore user-removed signals for untracked users

[Ray Strode <halfline src gnome org>]

commit 71801841e9871357060e750f1ddeb06c35c2187e
Author: Ray Strode <rstrode redhat com>
Date:   Tue May 24 22:15:10 2011 -0400

    gdm: ignore user-removed signals for untracked users
    
    If we don't know about a user, we don't care if it goes away,
    and we shouldn't try to remove it from the book keeping.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=647893
    (cherry picked from commit ff81659b9e619fd97cac40c426218ba152627457)

 src/gdmuser/gdm-user-manager.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/gdmuser/gdm-user-manager.c b/src/gdmuser/gdm-user-manager.c
index eba9da1..44c50ba 100644
--- a/src/gdmuser/gdm-user-manager.c
+++ b/src/gdmuser/gdm-user-manager.c
@@ -884,6 +884,13 @@ on_user_removed_in_accounts_service (DBusGProxy *proxy,
 
         user = g_hash_table_lookup (manager->priv->users_by_object_path, object_path);
 
+        if (user == NULL) {
+                g_debug ("GdmUserManager: ignoring untracked user %s", object_path);
+                return;
+        } else {
+                g_debug ("GdmUserManager: tracked user %s removed from accounts service", object_path);
+        }
+
         manager->priv->new_users = g_slist_remove (manager->priv->new_users, user);
 
         remove_user (manager, user);