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/Applications/SpaceAnalyzer/TreeMapWidget.cpp

@@ -316,8 +316,8 @@ void TreeMapWidget::doubleclick_event(GUI::MouseEvent& event)
 
 void TreeMapWidget::mousewheel_event(GUI::MouseEvent& event)
 {
-    int delta = event.wheel_delta();
-    // FIXME: The wheel_delta is premultiplied in the window server, we actually want a raw value here.
+    int delta = event.wheel_delta_y();
+    // FIXME: The wheel_delta_y is premultiplied in the window server, we actually want a raw value here.
     int step_size = GUI::WindowServerConnection::the().get_scroll_step_size();
     if (delta > 0) {
         size_t step_back = delta / step_size;