Revert hscroll on mac

The previous hscroll was based on a wrong precedence set by windows.

The PR to fix this on windows is at rust-windowing#2101

With this PR we now match what GLFW does: https://github.com/glfw/glfw/blob/53d86c64d709ff52886580d338d9b3b2b1f27266/src/cocoa_window.m#L614:L627

This will remove the need for a workaround in my egui crate at https://github.com/emilk/egui/blob/master/egui-winit/src/lib.rs#L456-L460

CHANGELOG.md

@@ -3,6 +3,7 @@
 - On X11, add mappings for numpad comma, numpad enter, numlock and pause.
 - On macOS, fix Pinyin IME input by reverting a change that intended to improve IME.
 - On Windows, fix a crash with transparent windows on Windows 11.
+- On Mac, reversed horizontal scrolling in `WindowEvent::MouseWheel` to match the direction of vertical scrolling.
 
 # 0.26.0 (2021-12-01)
 

src/platform_impl/macos/view.rs

@@ -1002,8 +1002,7 @@ extern "C" fn scroll_wheel(this: &Object, _sel: Sel, event: id) {
         let state = &mut *(state_ptr as *mut ViewState);
 
         let delta = {
-            // macOS horizontal sign convention is the inverse of winit.
-            let (x, y) = (event.scrollingDeltaX() * -1.0, event.scrollingDeltaY());
+            let (x, y) = (event.scrollingDeltaX(), event.scrollingDeltaY());
             if event.hasPreciseScrollingDeltas() == YES {
                 let delta = LogicalPosition::new(x, y).to_physical(state.get_scale_factor());
                 MouseScrollDelta::PixelDelta(delta)