g_signal_handlers_disconnect_matched (session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, seat);
seat->priv->sessions = g_list_remove (seat->priv->sessions, session);
if (session == seat->priv->active_session)
g_signal_handlers_disconnect_matched (session, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, seat);
seat->priv->sessions = g_list_remove (seat->priv->sessions, session);
if (session == seat->priv->active_session)