bug#67856: Dired navigation via directory line does not respect dired-kill-when-opening-new-dired-buffer

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 24 Dec 2023 12:11:49 -0800
> From: Jared Finder <jared@finder.org>
> Cc: 67856@debbugs.gnu.org
> 
> On 2023-12-21 05:18, Eli Zaretskii wrote:
> >> Date: Sat, 16 Dec 2023 12:35:10 -0800
> >> From:  Jared Finder via "Bug reports for GNU Emacs,
> >>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> >> 
> >> The option dired-kill-when-opening-new-dired-buffer is not respected
> >> when clicking on parent directories in the directory line at the top
> >> of dired buffers.  This can be fixed by calling
> >> dired--find-possibly-alternate-file instead of dired in the
> >> callback, as my attached patch does.
> >> 
> >> I believe changing to dired--find-possibly-alternate-file is safe
> >> because from playing around with dired, the directory being clicked
> >> on must be a directory and can not contain wildcards at this point.
> >> Therefore, at this point it is known that the directory is just a
> >> plain directory (no wildcards) and so going through find-file
> >> machinery will have the intended result.
> > 
> > If we want to install this on the emacs-29 release branch, I'd prefer
> > a safer variant, which actually verified that we don't call
> > dired--find-possibly-alternate-file with a wildcard.  That's because
> > we have quite a few features that place buffers in Dired mode, and we
> > could easily miss one that does have wildcards there.
> > 
> > So would you mind modifying the patch a little so that it checks
> > whether current-dir includes wildcards, and if so, calls 'dired'
> > instead of dired--find-possibly-alternate-file?
> 
> Done, new patch attached.  Luckily, there already is a function that 
> does exactly the right check.
> 
> Feel free to alter the comment explaining why this third code path 
> exists.  I wasn't sure the right style to indicate this type of 
> defensive code path that I am not certain is needed.

Thanks, installed on the emacs-29 branch with some minor reformatting,
and closing the bug.