if (!has_uid (priv->preregistered_uids, uid)) {
g_debug ("trying to unregister non-existing uid %s", uid);
priv->preregistered_uids = append_uid (priv->preregistered_uids, uid);
} else
g_debug ("unregistering uid %s", uid);
if (!has_uid (priv->preregistered_uids, uid)) {
g_debug ("trying to unregister non-existing uid %s", uid);
priv->preregistered_uids = append_uid (priv->preregistered_uids, uid);
} else
g_debug ("unregistering uid %s", uid);