bug#61726: [PATCH] Eglot: Support positionEncoding capability

[Eli Zaretskii]

> From: Augusto Stoffel <arstoffel@gmail.com>
> Cc: 61726@debbugs.gnu.org,  joaotavora@gmail.com
> Date: Thu, 23 Feb 2023 19:52:41 +0100
> 
> > In general, reporting coordinates in columns between programs is
> > problematic.  We see this in many cases, starting with spellers.
> 
> Yes, I agree this is problematic -- as soon as you leave the wonderful
> world of UTF-8.  The point of this patch is to stay in that wonderful
> world as long as the server agrees to it, which I hope will become
> commonplace.

Actually, the really "wonderful" world would be if the offsets were
reported in character codepoints, because buffer positions are both
the easiest for us to count and are unequivocally defined.