bug#50266: 28.0.50; expand-file-name broken with non ASCII characters

[Eli Zaretskii]

> Date: Mon, 30 Aug 2021 16:41:04 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 50266@debbugs.gnu.org
> 
> > From: Joakim Hårsman <joakim.harsman@gmail.com>
> > Date: Mon, 30 Aug 2021 15:36:06 +0200
> > 
> > No wait, scratch that. Emacs -Q has the same error. I accidentally started 
> > 27.2 where it works.
> > 
> > On Mon, 30 Aug 2021 at 15:34, Joakim Hårsman <joakim.harsman@gmail.com> 
> > wrote:
> > 
> >  emacs -Q works and returns the correct file name.
> 
> OK, thanks.  I guess we don't decode the file name somewhere.  Hmm...

Please try the latest master branch, I hope I fixed this.