bug#15917: 24.3.50; manual: mention keys reserved for users

[Lars Ingebrigtsen]

Stefan Kangas <stefan@marxist.se> writes:

>> Good question.  I assumed that this was about ASCII letters only, but
>> thinking about it, I don't see why: I think we should reserve all `C-c
>> LETTER' key sequences for the users.
>
> Agreed.  OTOH, it would be pretty odd for Emacs or any packages to bind
> non-ASCII letters.  I've never seen any software bind such keys by
> default, I think.

Perhaps nobody has thought of it.  :-)  But I guess it's because it's
rare for those keybinding to be very handy (except on national
keyboards).

I've now pushed the text (with amendments; feel free to tweak it further).

> But if we do add it, we should probably update `(elisp) Key Binding
> Conventions' as well.

Good point.  Now done as well.

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