Hi!

I think I have solved this.

The current coding system defined in ns-win.el didn't work because it only
provided a decode but no encode functions.

After revisiting the "hfs" encoder, I managed to get it to work, this time.

Below is a patch where I have dropped the old encoder and use the new
instead. The only thing noteworthy is that `ucs-normalize' is loaded by
loadup (when ns is used) and thus included in the dumped Emacs (if I
understand correctly). Unless anybody objects, I'll push it in a couple of
days.

    -- Anders

On Tue, Dec 15, 2015 at 9:05 PM, Anders Lindgren <andlind@gmail.com> wrote:

> Hi,
>
>
>> Can you write a patch to that effect, for emacs-25 branch?
>>
>
> We have the find the cause of the problem first. But once we do that, this
> should be straight forward.
>
>
> >     What does this return:
>> >
>> >     M-: (file-name-all-completion "åäö" "/that/empty/directory/") RET
>> >
>> > It returns nil.
>>
>> So this is the heart of the problem.  I assume that if you do the same
>> with an ASCII first argument, the result is non-nil, yes?
>>
>
> Yes.
>
>
>
>> Then the next step is to step with a debugger through
>> file_name_completion, and see why this returns nil instead of a list
>> of files that begin.
>>
>
> Auhm, I'll see what I can do. I'm a family father and have very, very,
> limited time, but I can see in I can find a time slot for it.
>
>     -- Anders
>
>