From 0a0d79ab8ff42649fc669dffce79b216f9edeb85 Mon Sep 17 00:00:00 2001
From: Jonathan Moore Liles <j.liles@unix.net>
Date: Fri, 6 Sep 2013 00:44:38 -0700
Subject: [PATCH] Reset extra mouse axes on each event.

---
 src/Fl_x.cxx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Fl_x.cxx b/src/Fl_x.cxx
index 912fc93..97c69e3 100644
--- a/src/Fl_x.cxx
+++ b/src/Fl_x.cxx
@@ -1733,14 +1733,18 @@ int fl_handle(const XEvent& thisevent)
     set_event_xy();
     if (xevent.xbutton.button == Button4) {
       Fl::e_dy = -1; // Up
+      Fl::e_dx = 0;
       event = FL_MOUSEWHEEL;
     } else if (xevent.xbutton.button == Button5) {
       Fl::e_dy = +1; // Down
+      Fl::e_dx = 0;
       event = FL_MOUSEWHEEL;
     } else if (xevent.xbutton.button == 6) {
+      Fl::e_dy = 0;
       Fl::e_dx = -1; // Left
       event = FL_MOUSEWHEEL;
     } else if (xevent.xbutton.button == 7) {
+      Fl::e_dy = 0;
       Fl::e_dx = +1; // Right
       event = FL_MOUSEWHEEL;      
     } else {