>
> I think we should remove that, and leave behind an alias that uses
> utf-8-hfs, which is provided by Emacs.  There's no reason to maintain
> 2 identical definitions.
>

Sounds reasonable. The implementation is vastly different, so getting rid
of one is definitively an improvement.


When you set file-name-coding-system to nil, Emacs uses
> default-file-name-system, which is utf-8, so it doesn't
> compose/decompose characters, and that's why you see what you see.
> IOW, using nil is a step backward.
>

I couldn't agree more!


What does this return:
>
>   M-: (file-name-all-completion "åäö" "/that/empty/directory/") RET
>

It returns nil.


Also, what is your value of completion-ignore-case?
>

It's nil.

Just out of curiosity -- how does `file-name-all-completions' work? Is the
FILE argument encoded to decomposed form, is the file list converted to
composed form, or is this handled by the comparison functions?

    -- Anders