pre8(vger) kills button 3 on 1-button mouse

[Martin Costabel]

The latest changes for 2-to-4-button mice on vger in
drivers/macintosh/mac_keyb.c (rev 1.24) break the emulation of button 3
on my 1-button Apple adb mouse.

This happens both in Xpmac, where option_right+click is hard-coded to
button 3, and in XF68_FBDev, where I use a patch by Franz Sirl for the
adb_buttons kernel command to get the same effect.

The reason seems to be that in rev 1.24 option_right gets mapped to
option_left even in raw mode (same for ctrl, BTW). I don't understand
this from the code, which is too complicated for me, anyway, but from
looking at the effect, as witnessed by xev in Xpmac, for example.

For the moment, I went back to rev 1.23 which doesn't have this problem.

--
Martin

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