bug#81606: Mojibake with UTF-8 file names

Eli Zaretskii <[email protected]> writes:

> Edebug has a command to produce a backtrace; please use that.

Ah, thanks for the hint:

--8<---------------cut here---------------start------------->8---
latexenc-find-file-coding-system((insert-file-contents "/path/to/ä-include.tex" t nil nil nil))
insert-file-contents("~/path/to/ä-include.tex" t)
find-file-noselect-1(#<buffer ä-include.tex> "~/path/to/ä-include.tex" nil nil "~/path/to/ä-include.tex" (125108739 16777233))
find-file-noselect("~/path/to/ä-include.tex" nil nil t)
find-file("~/path/to/ä-include.tex" t)
funcall-interactively(find-file "~/path/to/ä-include.tex" t)
command-execute(find-file)
--8<---------------cut here---------------end--------------->8---

> You are aware that \303\244 is the UTF-8 sequence for ä, are you?

Yes, I'm aware of that.

> The above seems to mean that the search is done on a unibyte buffer or
> something.

This is what I meant to say, thanks.  

I wrote this in my initial reply to this report:

  So I think `latexenc-find-file-coding-system' returns the wrong value
  since Emacs hasn't set its coding for read properly when that function
  kicks in.  I admit I'm not knowledgeable in this area, so my pretty
  simple recommendation is to customize the variable
  `file-coding-system-alist' and do something like this:

    (add-to-list 'file-coding-system-alist
                 '("\\.\\(tex\\|ltx\\|dtx\\|drv\\)\\'" . prefer-utf-8))

Apologies if the wording is not accurate, but I tried to say the same
thing as you above.

Best, Arash