bug#1374: 23.0.60; directory-files unexpectedly non-nil

[Markus Triska <markus.triska@gmx.at>]

Let ~/tmp be initially empty, and create these 7 files in it via:

  for i in 0085-ottosson.ps.gz 0091-lindgren.ps.gz    \
           0104-pettersson-carlsson.ps.gz 0108-carlsson.ps.gz   \
           0118-lindgren.ps.gz 1076.pdf apl_slides.pdf; do touch $i; done

As expected,

   (directory-files "~/tmp" nil "nonexistent")

then yields "nil". However, after I evaluate (in emacs -Q) the forms:

   (defun my-log (start end old)
     (write-region (point-min) (point-min) "/tmp/my-log-file.tmp" t 'silent))

   (add-hook 'after-change-functions 'my-log)

the new result of

   (directory-files "~/tmp" nil "nonexistent")

is unexpectedly:

   ("apl_slides.pdf")

using OSX. In Ubuntu Intrepid, the new result is, again unexpectedly:

   ("1076.pdf")

In GNU Emacs 23.0.60.2 (i386-apple-darwin8.11.1, GTK+ Version 2.12.9)
 of 2008-11-05 on mt-computer.local
Windowing system distributor `The XFree86 Project, Inc', version 11.0.40400000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t