[4->5 reg] WindowBlocked and WindowUnblocked events not being delivered to eventFilter()

The WindowBlocked and WindowUnblocked events are not being delivered to an event filter installed on a QMainWindow. All other events are being delivered. See attached test case. It will show a main window and a dialog. Close the dialog and the main window. In the console you will see debug output indicating the WindowBlocked event was delivered to event() of the QMainWindow but not to eventFilter()