[RP] definekey only grabs one key

[Torbjörn Söderstedt]

Using definekey for the top keymap, I tried to assign a command to "minus". It
didn't work, and after some investigation I found that I have two minus keys on
my keyboard:

$ xmodmap -pk | grep minus
     20       0x002d (minus)    0x005f (underscore)     0x002d (minus)  0x005f 
(underscore)     0x0aaa (endash) 0x0aa9 (emdash)
     94       0x002d (minus)    0x005f (underscore)     0x002d (minus)  0x005f 
(underscore)     0x0aaa (endash) 0x0aa9 (emdash)
    126       0x00b1 (plusminus)       0x0000 (NoSymbol)       0x00b1 
(plusminus)               0x0000 (NoSymbol)      0x00b1 (plusminus)

After remapping the key to the scancode with the lower value, it works as
expected. Is this a limitation in ratpoison, or some peculiarity of X11?