From 506e830cb0bb28c8be706df9116f0ddc23015df6 Mon Sep 17 00:00:00 2001
From: Benjamin Saunders <ben.e.saunders@gmail.com>
Date: Mon, 17 Jul 2017 22:50:47 -0700
Subject: [PATCH] Fix X11 scroll direction

This was inconsistent with the documented semantics of MouseScrollDelta.
---
 src/platform/linux/x11/mod.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/platform/linux/x11/mod.rs b/src/platform/linux/x11/mod.rs
index 4e71a522..66fee12a 100644
--- a/src/platform/linux/x11/mod.rs
+++ b/src/platform/linux/x11/mod.rs
@@ -413,7 +413,8 @@ impl EventsLoop {
                                             device_id: did,
                                             delta: match info.orientation {
                                                 ScrollOrientation::Horizontal => LineDelta(delta as f32, 0.0),
-                                                ScrollOrientation::Vertical => LineDelta(0.0, delta as f32),
+                                                // X11 vertical scroll coordinates are opposite to winit's
+                                                ScrollOrientation::Vertical => LineDelta(0.0, -delta as f32),
                                             },
                                             phase: TouchPhase::Moved,
                                         }});