bug#44905: 27.1; Packages that customize xref-show-xrefs-function can break Dired's dired-do-find-regexp-and-replace

[Eli Zaretskii <eliz@gnu.org>]

> Cc: 44905@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Mon, 30 Nov 2020 03:00:17 +0200
> 
> >> diff --git a/lisp/dired-aux.el b/lisp/dired-aux.el
> >> index 94a2bbf1f3..4caafc8df6 100644
> >> --- a/lisp/dired-aux.el
> >> +++ b/lisp/dired-aux.el
> >> @@ -3140,7 +3140,10 @@ dired-do-find-regexp-and-replace
> >>             (query-replace-read-args
> >>              "Query replace regexp in marked files" t t)))
> >>        (list (nth 0 common) (nth 1 common))))
> >> -  (with-current-buffer (dired-do-find-regexp from)
> >> +  (defvar xref-show-xrefs-function)
> >> +  (with-current-buffer
> >> +      (let ((xref-show-xrefs-function 'xref--show-xref-buffer))
> >> +        (dired-do-find-regexp from))
> >>       (xref-query-replace-in-results from to)))
> >>
> >>   (defun dired-nondirectory-p (file)
> > 
> > LGTM, thanks.
> 
> Eli, is this OK for Emacs 27.2?

Yes, thanks.

> Here's also a slightly more future-proofed version that avoids 
> referencing the function we might want to rename/change later:

That, too.