xdg-su not decorated with theme

LXDE on OpenSuse 13.2 uses xdg-su ass the GUI frontend to run applications using sudo. If it can't load gnomesu or kdesu then it presents a bland undecorated xterm window. This can be neatened by simply installing libgnomesu which is small with only 1 dependancy (it doesn't need a full gnome desktop!).