xcb: Convert synthetic mouse enter event position to native pixels

Mouse position is converted from native pixels later, so we must
provide native pixels for "QWindowSystemInterface::handleEnterEvent".

Amends 7091be1b79

Task-number: QTBUG-63865
Change-Id: I813c171f2fc1d321af702ac30eb5f2e4232e97c4
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

src/plugins/platforms/xcb/qxcbwindow.cpp

@@ -907,7 +907,9 @@ void QXcbWindow::hide()
             if (QWindow *childWindow = childWindowAt(enterWindow, cursorPos))
                 enterWindow = childWindow;
             const QPoint localPos = enterWindow->mapFromGlobal(cursorPos);
-            QWindowSystemInterface::handleEnterEvent(enterWindow, localPos, cursorPos);
+            QWindowSystemInterface::handleEnterEvent(enterWindow,
+                                                     localPos * QHighDpiScaling::factor(enterWindow),
+                                                     nativePos);
         }
     }
 }