bug#48324: 27.2; hexl-mode duplicates the UTF-8 BOM

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: rgm@gnu.org,  schwab@linux-m68k.org,  48324@debbugs.gnu.org
> Date: Sun, 03 Jul 2022 14:07:43 +0200
> 
> Lars Ingebrigtsen <larsi@gnus.org> writes:
> 
> > Hm...  I guess the only reliable solution across all coding systems is
> > (like your comment in the code says) to drop the encode-every-char and
> > try encoding strings, and then see whether the result is short enough.
> > That could be done somewhat efficiently using a binary search.  I'll
> > have a go at it...
> 
> And while I was at it, I changed it to return complete glyphs, not just
> complete code points.
> 
> There's a behavioural change, though.  This: 
> 
> (string-limit "foóá" 6 t 'utf-16)
> 
> Now returns a string with a BOM, whereas previously it didn't.

So you get 6 characters + the BOM?