bug#9814: 23.3; unguarded setq of default-directory in ido.el

[Chong Yidong]

Dave Abrahams <dave@boostpro.com> writes:

> I'm sorry that I don't have a reproducer at the moment.  I was having
> some failures during startup that would leave my Emacs unable to change
> buffers with `M-x switch-to-buffer', which was remapped to
> ido-switch-buffer, because it would attempt to make a Tramp connection
> to some nonexistent host.  I could get around this by `M-: (setq
> default-directory "~")', so I went hunting in ido.el for mentions of
> default-directory and found 2 instances of (setq default-directory...)
> that were not apparently surrounded by a let.  This seems like a likely
> cause of the problem.

I'm not too familiar with ido, and do not know whether those setqs are
intentional.  Could you try let-binding default-directory in those
locations and test it out for a while, and see if there is any effect?

=== modified file 'lisp/ido.el'
*** lisp/ido.el 2011-10-26 08:42:22 +0000
--- lisp/ido.el 2011-10-29 05:42:48 +0000
***************
*** 2381,2389 ****
  
         ((eq method 'alt-file)
        (ido-record-work-file filename)
!       (setq default-directory ido-current-directory)
!       (ido-record-work-directory)
!       (find-alternate-file filename))
  
         ((memq method '(dired list-directory))
        (if (equal filename ".")
--- 2381,2389 ----
  
         ((eq method 'alt-file)
        (ido-record-work-file filename)
!       (let ((default-directory ido-current-directory))
!         (ido-record-work-directory)
!         (find-alternate-file filename)))
  
         ((memq method '(dired list-directory))
        (if (equal filename ".")
***************
*** 2421,2432 ****
  
         ((eq method 'write)
        (ido-record-work-file filename)
!       (setq default-directory ido-current-directory)
!       (setq filename (concat ido-current-directory filename))
!       (ido-record-command 'write-file filename)
!       (add-to-history 'file-name-history filename)
!       (ido-record-work-directory)
!       (write-file filename t))
  
         ((eq method 'read-only)
        (ido-record-work-file filename)
--- 2421,2432 ----
  
         ((eq method 'write)
        (ido-record-work-file filename)
!       (let ((default-directory ido-current-directory))
!         (setq filename (concat ido-current-directory filename))
!         (ido-record-command 'write-file filename)
!         (add-to-history 'file-name-history filename)
!         (ido-record-work-directory)
!         (write-file filename t)))
  
         ((eq method 'read-only)
        (ido-record-work-file filename)