X11 - Ignore scroll events that happen outside of Glutin windows

Scroll deltas are calculated in X11 by comparing the current and
previous absolute values for the scroll axis when a scroll motion
event is received. If the user scrolls whilst the cursor is outside
of the window then an incorrect delta is reported when the cursor
re-enters the window.

Fix this by resetting the last-seen axis values whenever the cursor
re-enters the window.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/api/x11/window.rs b/src/api/x11/window.rs
index b430ec9..9a01e17 100644
--- a/src/api/x11/window.rs
+++ b/src/api/x11/window.rs
@@ -7,7 +7,6 @@ use std::{mem, ptr};
 use std::cell::Cell;
 use std::sync::atomic::AtomicBool;
 use std::collections::VecDeque;
-use std::slice::from_raw_parts;
 use std::sync::{Arc, Mutex};
 
 use Api;
@@ -23,7 +22,7 @@ use api::egl::Context as EglContext;
 use platform::MonitorID as PlatformMonitorID;
 
 use super::input::XInputEventHandler;
-use super::{events, ffi};
+use super::{ffi};
 use super::{MonitorID, XConnection};
 
 // XOpenIM doesn't seem to be thread-safe