bug#58512: Patch to make cperl-perldoc call perldoc case-insensitively

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

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The attached patch calls perldoc with -i, so it is case insensitive. This
is more convenient (the user doesn't have to get the case right), and works
like "man". I find this particularly useful for perl, as many modules and
functions have mixed case in their names.

-- 
https://rrt.sc3d.org

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From b175a9fb7eea49cdf8171821498f2c5efaaecd98 Mon Sep 17 00:00:00 2001
From: Reuben Thomas <rrt@sc3d.org>
Date: Fri, 14 Oct 2022 13:30:43 +0200
Subject: [PATCH] Do perl documentation lookups case-insensitively, like man

* lisp/progmodes/cperl-mode.el (cperl-perldoc): add -i to the perldoc
command.
---
 lisp/progmodes/cperl-mode.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/progmodes/cperl-mode.el b/lisp/progmodes/cperl-mode.el
index 20a73e238e9..539b2771490 100644
--- a/lisp/progmodes/cperl-mode.el
+++ b/lisp/progmodes/cperl-mode.el
@@ -8323,7 +8323,7 @@ cperl-perldoc
 				  'cperl-short-docs
 				  'variable-documentation))))
 	 (Man-switches "")
-	 (manual-program (if is-func "perldoc -f" "perldoc")))
+         (manual-program (concat "perldoc -i" (if is-func " -f"))))
     (Man-getpage-in-background word)))
 
 ;;;###autoload
-- 
2.34.1