Enter handling requires knowledge of the mouse
position. Extend the enter handling of
QWindowSystemInterface to receive the position
(implemented for Windows, XCB and Mac), passing it
on to QEnterEvent. Dispatch QEnterEvent from
widgets code.
Change-Id: I49c07d2b1f46310c877017dd55d4cd7d636bdbce
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>