From 2252ba98390505f353ea35e8ade3e3914b46c977 Mon Sep 17 00:00:00 2001
From: Albrecht Schlosser <albrechts.fltk@online.de>
Date: Sun, 7 Jul 2024 20:00:43 +0200
Subject: [PATCH] X11: don't send FL_RELEASE event after FL_MOUSEWHEEL

Horizontal mousewheel events use pseudo button numbers 6 and 7, resp.,
similar to vertical mousewheel events which use buttons 4 and 5.

The old code erroneously sent FL_RELEASE events for buttons 6 and 7
although it was prevented for buttons 4 and 5 explicitly.
---
 src/Fl_x.cxx | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/Fl_x.cxx b/src/Fl_x.cxx
index 9f06c5421..00ddaed2e 100644
--- a/src/Fl_x.cxx
+++ b/src/Fl_x.cxx
@@ -2067,8 +2067,9 @@ int fl_handle(const XEvent& thisevent)
     Fl::e_keysym = FL_Button + xevent.xbutton.button;
     set_event_xy(window);
     Fl::e_state &= ~(FL_BUTTON1 << (xevent.xbutton.button-1));
-    if (xevent.xbutton.button == Button4 ||
-        xevent.xbutton.button == Button5) return 0;
+    if (xevent.xbutton.button > Button3) { // "buttons" 4-7 = mousewheel events: don't send FL_RELEASE
+      return 0;
+    }
     event = FL_RELEASE;
 
 #if FLTK_CONSOLIDATE_MOTION