bug#46271: 28.0.50; [PATCH] Properly quote group names for gnus-search

[jflack--- via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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The new gnus-search-indexed-parse-output doesn't properly quote group
names before using them as regexes meaning a group name containing
meta-characters (other than . or \ because of the current replacement)
won't be properly matched in the search results later.

I have attached a diff that fixes this by first quoting the group name
before performing the replacement; which is now constructed with RX
to save \\ soup.

=2D-=20
Thanks,
Jai

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diff --git a/lisp/gnus/gnus-search.el b/lisp/gnus/gnus-search.el
index 44f43b073c..54603d8792 100644
=2D-- a/lisp/gnus/gnus-search.el
+++ b/lisp/gnus/gnus-search.el
@@ -82,6 +82,7 @@
 (require 'gnus-util)
 (require 'eieio)
 (eval-when-compile (require 'cl-lib))
+(eval-when-compile (require 'rx))
 (autoload 'eieio-build-class-alist "eieio-opt")
 (autoload 'nnmaildir-base-name-to-article-number "nnmaildir")
=20
@@ -1380,8 +1381,8 @@ gnus-search-indexed-parse-output
 			 (lambda (x)
 			   (replace-regexp-in-string
 			    ;; Accept any of [.\/] as path separators.
=2D			    "[.\\/]" "[.\\\\/]"
=2D			    (gnus-group-real-name x)))
+			    (rx (or "\\." "\\\\" "/")) "[.\\\\/]"
+			    (regexp-quote (gnus-group-real-name x))))
 			 groups "\\|")))
 	artlist vectors article group)
     (goto-char (point-min))

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