[Evolution] Bug#327757: #327757 - evolution: Bug maybe fixed upstream?

[Brett Smith]

I think this bug may have been fixed upstream a couple of weeks ago when
they updated the code to use GtkComboBox instead.  See
<http://svn.gnome.org/viewvc/evolution/trunk/composer/e-msg-composer-hdrs.c?revision=34620&view=markup>
and note this callback:

     g_signal_connect_swapped (
          widget, "changed",
          G_CALLBACK (signature_changed), hdrs);