QGuiApplication: Propagate wheel event accepted state

Propagate the accepted state from the QtGui event to
the QWindowsSystemInterface event. This makes it possible
for the platform plugins to propagate rejected wheel events
to the native OS.

Pick-to: 6.5
Task-number: QTBUG-107441
Change-Id: Ifa90ed2430e56120a1a04b6a5872a153d26aa6bc
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

src/gui/kernel/qguiapplication.cpp

@@ -2369,6 +2369,7 @@ void QGuiApplicationPrivate::processWheelEvent(QWindowSystemInterfacePrivate::Wh
                    mouse_buttons, e->modifiers, e->phase, e->inverted, e->source, device);
     ev.setTimestamp(e->timestamp);
     QGuiApplication::sendSpontaneousEvent(window, &ev);
+    e->eventAccepted = ev.isAccepted();
 #else
      Q_UNUSED(e);
 #endif // QT_CONFIG(wheelevent)