Fix misgenerated QHoverEvent

https://doc.qt.io/qt-6/qhoverevent.html#oldPos

https://doc.qt.io/qt-6/qhoverevent-obsolete.html#pos

oldPos: On QEvent::HoverEnter events, this position will always be QPoint(-1, -1).

pos: On QEvent::HoverLeave events, this position will always be QPoint(-1, -1).

On the same app, such as Wayland-enabled VS Code, the misgeneration causes the cursor to move to the origin when moving the cursor away from the server side decoration.

src/pointer_input.cpp

@@ -484,7 +484,7 @@ void PointerInputRedirection::cleanupDecoration(Decoration::DecoratedClientImpl
 
     if (old) {
         // send leave event to old decoration
-        QHoverEvent event(QEvent::HoverLeave, QPointF(), QPointF());
+        QHoverEvent event(QEvent::HoverLeave, QPointF(-1, -1), QPointF());
         QCoreApplication::instance()->sendEvent(old->decoration(), &event);
     }
     if (!now) {
@@ -493,7 +493,7 @@ void PointerInputRedirection::cleanupDecoration(Decoration::DecoratedClientImpl
     }
 
     auto pos = m_pos - now->window()->pos();
-    QHoverEvent event(QEvent::HoverEnter, pos, pos);
+    QHoverEvent event(QEvent::HoverEnter, pos, QPointF(-1, -1));
     QCoreApplication::instance()->sendEvent(now->decoration(), &event);
     now->window()->processDecorationMove(pos, m_pos);