[empathy] roster-view: make sure the same contact isn't added twice to the same group

[Guillaume Desmottes <gdesmott src gnome org>]

commit c11c1cb31e7b46f89de4fd41f9d75f2731c5ded0
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Thu Aug 30 12:06:42 2012 +0200

    roster-view: make sure the same contact isn't added twice to the same group
    
    Calling empathy_roster_model_get_groups_for_individual() in individual_added
    may have the side effect for folks to discover the contact's groups and so
    fire a bunch of signals leading us to add the contact in the group.
    Then we look for his groups in individual_added() and re-add him a second
    time.
    
    Fix this by making sure we won't add the same contact twice to the same group.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=683025

 libempathy-gtk/empathy-roster-view.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/libempathy-gtk/empathy-roster-view.c b/libempathy-gtk/empathy-roster-view.c
index a820d2b..4ad2d16 100644
--- a/libempathy-gtk/empathy-roster-view.c
+++ b/libempathy-gtk/empathy-roster-view.c
@@ -270,6 +270,9 @@ add_to_group (EmpathyRosterView *self,
   if (contacts == NULL)
     return;
 
+  if (g_hash_table_lookup (contacts, group) != NULL)
+    return;
+
   if (tp_strdiff (group, NO_GROUP))
     roster_group = ensure_roster_group (self, group);