From 0545c70c168d2cc3f4fa794312b23f2616f67327 Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Thu, 21 Oct 2021 10:53:20 +0300
Subject: [PATCH] ; * src/keyboard.c (readable_events): Add a comment.

---
 src/keyboard.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/keyboard.c b/src/keyboard.c
index 6895a249f22..a99d14cb4cf 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -3462,6 +3462,8 @@ readable_events (int flags)
      READABLE_EVENTS_FILTER_EVENTS is set, report it as empty.  */
   if (kbd_fetch_ptr != kbd_store_ptr)
     {
+      /* See https://lists.gnu.org/r/emacs-devel/2005-05/msg00297.html
+	 for why we treat toolkit scroll-bar events specially here.  */
       if (flags & (READABLE_EVENTS_FILTER_EVENTS
 #ifdef USE_TOOLKIT_SCROLL_BARS
 		   | READABLE_EVENTS_IGNORE_SQUEEZABLES
-- 
2.39.2