Userland: Add horizontal mouse scroll support

Author: https://github.com/can3p
Commit: 1662213737
Pull-request: https://github.com/SerenityOS/serenity/pull/11246
Reviewed-by: https://github.com/kleinesfilmroellchen ✅

Userland/Libraries/LibGUI/AbstractZoomPanWidget.cpp

@@ -111,7 +111,7 @@ Gfx::FloatRect AbstractZoomPanWidget::content_to_frame_rect(Gfx::IntRect const&
 
 void AbstractZoomPanWidget::mousewheel_event(GUI::MouseEvent& event)
 {
-    float new_scale = scale() / AK::exp2(event.wheel_delta() / wheel_zoom_factor);
+    float new_scale = scale() / AK::exp2(event.wheel_delta_y() / wheel_zoom_factor);
     scale_centered(new_scale, event.position());
 }