This was apparently done so in each of the widget_<platform>.cpp
in Qt 4.8. This then causes the cursor to be updated in
dispatchEnterLeave() on Windows and Linux.
Task-number: QTBUG-27871
Task-number: QTBUG-27585
Task-number: QTBUG-26424
Change-Id: Idf14cd96ccb36f7c2607853ed8b0024c36a5413c
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>