There are a number of places in Empathy where a GSettings changed:: signal is being used to update the toggled/sensitive/etc. of a GtkWidget. These instances should be identified and replaced with uses of g_settings_bind()

This is the pattern to look for:

static void notify_cb (GSettings *gsettings, ...)
{
    gtk_toggle_button_set_active (toggle_button,
        g_settings_get_boolean (gsettings, key));
}

construct_ui (...)
{
    g_signal_connect (gsettings, "changed::" SOME_KEY_NAME,
        G_CALLBACK (notify_cb), something);
    notify_cb (gsettings, SOME_KEY_NAME, something);
}

It can be replaced by:

g_settings_bind (gsettings, key, widget, "property", G_SETTINGS_BIND_GET);