might a bug in ido-mode

[zwz <zhangweize@gmail.com>]

I found a problem that crashes emacs.
The problem seems a little random, but I produced it twice by:

1. start the emacs: emacs -q
2. eval the elisp code below in the scratch buffer:

(setq ido-save-directory-list-file "~/.emacs.d/.ido.last"
      ido-create-new-buffer 'always
      ido-enable-flex-matching t
      ido-enable-tramp-completion t)
(ido-mode t)

3. C-x C-f, and input a file name like "main.c".
   Wait a second, while the the ido-mode is looking for "main.c", hit
   the keys C-j (if no problem, then a buffer "main.c" is created)
4. do 3 again, with the same file name in the same directory.
   When you hit C-j during the ido-mode's searching, emacs crashes!
   (maybe you have to try more times to get the problem)

By the way, I am using GNU Emacs 24.0.50.1 (i386-mingw-nt6.0.6002) of
2010-04-24 On Window Vista