OPTIONS=menu_previous_page:\mv
BINDINGS=M-v:menu_previous_page
both worked, but
OPTIONS=menu_previous_page:M-v
BINDINGS=\mv:menu_previous_page
both failed. Make all four variations work. Tiny change made large
by the need to move some things around.
The option definition for menu_first_page had a couple of its flag
bits swapped. I didn't try to figure out whether that had any impact.
d8bef90009