void HandleQueryChanged (IBrowsableCollection sender)
{
if (find_untagged.Active != query.Untagged)
find_untagged.Active = query.Untagged;
clear_date_range.Sensitive = (query.Range != null);
clear_rating_filter.Sensitive = (query.RatingRange != null);
update_status_label = true;
GLib.Idle.Add (UpdateStatusLabel);
}