bug#38296: Allow Option key to be modifier for non-char key and mouse events

[Richard Stallman]

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  > Looking at Mitsuharu Yamamoto's Mac port made me change my mind: it solves 
the problem by allowing the variables to have values on the form (:ordinary 
SYMBOL :function SYMBOL :mouse SYMBOL), defining each modifier key separately 
for ordinary keys, function keys and mouse events.

I'd like to understand what that feature does, but I can't tell from
that text.  Does it come with any documentation?  If so, coulod you
please show it?

Also, are you proposing we implement this for ALL platforms (that
would be clean and simple, in principle)?  Or just SOME platforms?

-- 
Dr Richard Stallman
Founder, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)