Make top-level windows generate enter/leave events
for sub-windows. Keep track of the current "under mouse"
window in mouseMoved and send EnterLeave events when
it changes.
mouseEntered/mouseExited handles enters and leaves
from the top-level window.
Add tests/manual/cocoa/nativewidgets.
Task-number: QTBUG-27550
Task-number: QTBUG-29751
Change-Id: If4b9f9e0f39d9fb05fdab45a100ffdcf107965ad
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
