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

[Mattias Engdegård]

21 nov. 2019 kl. 22.12 skrev Alan Third <alan@idiocy.org>:

> Do you think this functionality will only be required for the
> alt/option key or will there be a demand to add it for command too? In
> my experience the characters available via command are rather more
> obscure, but I’ve little experience with non‐UK keyboards.

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.

This is more flexible, and turned out to be rather simple to implement, so I 
think this is better than adding variables. I did it for all ns-KEY-modifier 
and ns-right-KEY-modifier variables (KEY being control, command, alternate and 
function), since it seemed silly not to. The relevant macOS-specific 
documentation was improved as well.

Doing so also reduces gratuitous incompatibility with the Mac port.

Here is the new patch. Maybe we can get it done before Eli branches off Emacs 
27.

0001-Fine-grained-NS-modifier-key-settings-bug-38296.patch
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