bug#43830: keyboard layout handling incompatible with rest of the OS

[Eli Zaretskii <eliz@gnu.org>]

> From: Paul Pogonyshev <pogonyshev@gmail.com>
> Date: Sun, 1 Nov 2020 17:51:00 +0100
> Cc: Eli Zaretskii <eliz@gnu.org>, 43830@debbugs.gnu.org
> 
> > > What about functions like `read-event'? It returns integers if I press
> > > M-[letter] or C-[letter].
> > 
> > read-event is also implemented in C.  But maybe I don't understand
> > your question.
> 
> I mean, what about the cases where it is called from Elisp?  It is
> implemented in C, but also is publicly available.
> 
> I have come up with two ideas:
> 
> 1. `read-event' and its internal C implementation grow an optional
> parameter that says whether to return character as if being typed (as
> now) or for keybinding use (i.e. from physical keys).
> 
> 2. Alternatively, if this cannot be determined in advance (i.e. before
> calling `read-event' etc.), these functions could set variable named sth.
> like `last-keybinding-keycode'. Then the caller would use either the
> return value (as now) or, if it wants, the value of the variable instead.

What I had in mind was

 0. read-event will figure out by itself whether it should return the
 ASCII character or a non-ASCII character, and return that.