QDockWidget Does not render properly when floating if CentralWidget is QGLWidget (OSX)

Hello,

Hopefully my title was descriptive enough. I have just spent the last two days testing this bug inside out to make sure it's not my code. It isn't! If the central Widget of a QMainWindow is a QGLWidget, or if the QGLwidget is in a layout, DockWidgets do not render when floating. They render fine when docked but when undocked the are just blank white windows.

On many tests this does not happen as soon as the QGLWidget is removed. Also an extremely important note, this only happens on OSX. I have ben testing on OSX 10.7.5. I first tested this on Qt 5.0.2. I then tested it on Qt5.1.0 beta1.

I do hope this can be fixed before 5.1.0

David