one can't unfold a "mouse tree" to select another mouse with the german
If you are using the keyboard to navigate the mouseconfig screen in the GUI
installer, then you will need to hit "+" to expand the tree. Actually, you need
to hit the "+" key to expand the tree no matter the keymap that you have
definitly didn4t work with +
no gnome tree can be opened by '+' and
it can only be closed by '-'
tested with gnomecc ... :(