Fix horizontal scrolling direction on Linux

Closes https://github.com/emilk/egui/issues/356

Work-around until https://github.com/rust-windowing/winit/pull/2105 is merged and released

eframe/CHANGELOG.md

@@ -8,6 +8,7 @@ NOTE: [`egui_web`](egui_web/CHANGELOG.md), [`egui-winit`](egui-winit/CHANGELOG.m
 * Removed `Frame::alloc_texture`. Use `egui::Context::load_texture` instead ([#1110](https://github.com/emilk/egui/pull/1110)).
 * The default native backend is now `egui_glow` (instead of `egui_glium`) ([#1020](https://github.com/emilk/egui/pull/1020)).
 * The default web painter is now `egui_glow` (instead of WebGL) ([#1020](https://github.com/emilk/egui/pull/1020)).
+* Fix horizontal scrolling direction on Linux.
 
 
 ## 0.16.0 - 2021-12-29

egui-winit/CHANGELOG.md

@@ -4,6 +4,7 @@ All notable changes to the `egui-winit` integration will be noted in this file.
 
 
 ## Unreleased
+* Fix horizontal scrolling direction on Linux.
 * Replaced `std::time::Instant` with `instant::Instant` for WebAssembly compatability ([#1023](https://github.com/emilk/egui/pull/1023))
 
 

egui-winit/src/lib.rs

@@ -453,12 +453,8 @@ impl State {
                 egui::vec2(delta.x as f32, delta.y as f32) / self.pixels_per_point()
             }
         };
-        if cfg!(target_os = "macos") {
+
-            delta.x *= -1.0; // until https://github.com/rust-windowing/winit/pull/2105 is merged and released
+        delta.x *= -1.0; // Winit has inverted hscroll. Remove this line when we update winit after https://github.com/rust-windowing/winit/pull/2105 is merged and released
-        }
-        if cfg!(target_os = "windows") {
-            delta.x *= -1.0; // until https://github.com/rust-windowing/winit/pull/2101 is merged and released
-        }
 
         if self.egui_input.modifiers.ctrl || self.egui_input.modifiers.command {
             // Treat as zoom instead: