bug#67683: 30.0.50; [PATCH] Fix 'M-.' on Emacs C sources

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

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Hi,

I don't know how but for some times now 'M-.' is broken for me on C
sources.  The attach patch seems reasonable and fixes this issue.  I
guess that the title of this patch should be reworked but I don't really
know how to put it.


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From 1059d89317364943b85e6cc043b0e5285734e000 Mon Sep 17 00:00:00 2001
From: Manuel Giraud <manuel@ledu-giraud.fr>
Date: Thu, 7 Dec 2023 10:44:39 +0100
Subject: [PATCH] Fix 'M-.' on Emacs C sources

* lisp/progmodes/etags.el (tags-included-tables): Ensure that
'tags-included-tables-function' is a function.
---
 lisp/progmodes/etags.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/progmodes/etags.el b/lisp/progmodes/etags.el
index d48dcc6659d..c2fcbaee91f 100644
--- a/lisp/progmodes/etags.el
+++ b/lisp/progmodes/etags.el
@@ -773,7 +773,8 @@ tags-included-tables
   "Return a list of tags tables included by the current table.
 Assumes the tags table is the current buffer."
   (or tags-included-tables
-      (setq tags-included-tables (funcall tags-included-tables-function))))
+      (setq tags-included-tables (and (functionp tags-included-tables-function)
+                                      (funcall tags-included-tables-function)))))
 \f
 (defun tags-completion-table (&optional buf)
   "Build `tags-completion-table' on demand for a buffer's tags tables.
-- 
2.43.0


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In GNU Emacs 30.0.50 (build 1, x86_64-unknown-openbsd7.4) of 2023-12-06
 built on computer
Repository revision: d8a00879309a3bf62f6ffcae103aa3bdba776ee9
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101009
System Description: OpenBSD computer 7.4 GENERIC.MP#1471 amd64

Configured using:
 'configure CPPFLAGS=-I/usr/local/include LDFLAGS=-L/usr/local/lib
 MAKEINFO=gmakeinfo --prefix=/home/manuel/emacs
 --bindir=/home/manuel/bin --with-x-toolkit=no --without-cairo
 --without-dbus --without-gconf --without-gsettings --without-sound
 --without-compress-install'

Configured features:
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MODULES NOTIFY KQUEUE OLDXMENU PDUMPER PNG RSVG SQLITE3 THREADS TIFF
TREE_SITTER WEBP X11 XDBE XFT XIM XINPUT2 XPM ZLIB

Important settings:
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Major mode: VC dir

Minor modes in effect:
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Load-path shadows:
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Memory information:
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-- 
Manuel Giraud