check if old_parent_private is not NULL before trying to g_list_remove the

check if old_parent_private is not NULL before trying to g_list_remove the

Mon Jul 13 12:42:51 1998  George Lebl  <jirka@5z.com>

        * gdk/gdkwindow.h: (gdk_window_reparent) check if old_parent_private
          is not NULL before trying to g_list_remove the child. A patch
          from Michael Lausch.

this finally fixes the swallows for the panel :)