QMainWindow size property getter and setter do not align when using Unified Toolbar on Cocoa

The size() reports the size without the unifiedtoolbar, but calling resize resizes the whole window, including the toolbar.

http://doc.trolltech.com/4.7/qmainwindow.html#unifiedTitleAndToolBarOnMac-prop

//in any QMainWindow on mac with unified toolbar, for example the macmainwindow demo application.
resize(500,500);
qDebug() << "size" << size();
//output:
size QSize(500, 462)

This is constant, so an easy workaround is to adjust the returned height value depending on the height of the toolbar.