From 4de3afd5cca5a183e4162db981933c4eddb899c4 Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Sat, 14 Dec 2024 11:57:04 +0200
Subject: [PATCH] ; * etc/PROBLEMS: Document problem with menu-bar background
 (bug#74028).

(cherry picked from commit 6942599dbb24c1a469e3d3708df83692b49e4af8)
---
 etc/PROBLEMS | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index 30506b3c87a..8de12a78613 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -1588,6 +1588,12 @@ https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22000,
 https://debbugs.gnu.org/cgi/bugreport.cgi?bug=22898 and
 https://lists.gnu.org/r/emacs-devel/2016-07/msg00154.html.
 
+*** In Emacs built with GTK+ toolkit, menu-bar background becomes transparent.
+
+This happens when 'alpha-background' is less than 100.  This is due a
+GTK limitation, for which no workaround is currently known,
+unfortunately.
+
 *** Metacity: Resizing Emacs or ALT-Tab causes X to be unresponsive.
 
 This happens sometimes when using Metacity.  Resizing Emacs or ALT-Tab:bing
-- 
2.39.2