QMainWindow jitter on resize() in MacOSX

This is exactly the same phenomenon reported in QT bug 6384 assigned to Fabien Freling
but it happens in another way. Communicating because I would like to be sure that the
fix for 6384 also fixes my problem in release 4.7.

In brief I have a master and a slave window. When the master is resized with the size grip
I capture the resize by writing my own resizeEvent() and then send a resize(event->size())
to the slave. The idea is that the slave has the same size as the master whenever the
master is resized.

Get the white-flicker observed in bug 6384 – when the resize expands the slave its buffered contents,
including the window decoration, are moved to bottom-right exposing a white background in the upper
left. Then the window contents and decoration resize. I attache the shortest code I could come up
with that illustrates the problem. Sure do hope its fixed in 4.7. Thanks, Gene