bug#29189: 25.3; Dired does not work with binary filenames

[Eli Zaretskii <eliz@gnu.org>]

> From: Allen Li <vianchielfaura@gmail.com>
> Date: Wed, 15 Nov 2017 22:31:48 -0800
> Cc: handa@gnu.org, Andreas Schwab <schwab@suse.de>, 29189@debbugs.gnu.org
> 
> > diff --git a/lisp/files.el b/lisp/files.el
> > index b47411f..43198bc 100644
> > --- a/lisp/files.el
> > +++ b/lisp/files.el
> > @@ -6803,10 +6803,13 @@ insert-directory
> >                             val (get-text-property (point) 'dired-filename))
> >                       (goto-char (next-single-property-change
> >                                   (point) 'dired-filename nil (point-max)))
> > -                     ;; Force no eol conversion on a file name, so
> > -                     ;; that CR is preserved.
> > -                     (decode-coding-region pos (point)
> > -                                           (if val coding-no-eol coding))
> > +                      (let ((fn (buffer-substring-no-properties pos (point))))
> > +                        (delete-region pos (point))
> > +                        (insert
> > +                        ;; Force no eol conversion on a file name, so
> > +                        ;; that CR is preserved.
> > +                        (decode-coding-string (string-make-unibyte fn)
> > +                                              (if val coding-no-eol coding))))
> >                       (if val
> >                           (put-text-property pos (point)
> >                                              'dired-filename t)))))))
> 
> This patch works for me.

Thanks for testing.  I'm still worried that we need to force text to
be unibyte in order for the decoding to work.  So I'd like to dig into
the code to understand why, and maybe try to fix it if I find some
problems there.  If I succeed, the result will work faster, because
the above patch is less efficient that decode-coding-region.  Let me
look into this and get back to you in a few days.