Use QCoreApplication::postEvent() for replaying popup mouse events.

When replaying the mouse events synchronously, nested calls
of QEventLoop::exec() may happen in conjunction with menus.

Task-number: QTBUG-38550
Change-Id: I2b1dafdac59d1a080775af5f165d1e594ea58804
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Revert "Ignore tst_QStyleSheetStyle::hoverColors() failures on Mac OS X"

This test doesn't fail on Mac any more.

This reverts commit 36493a7a41b7ce38af429a943a73d791100c6c13.

Task-number: QTBUG-23685
Change-Id: Ib7c56494b07de9839b3287758fe228f799bc343c
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>