REG: Mac non-native QMenubar menuitems spacing/gap missing

#include "mainwindow.h" 
#include <QApplication> 
#include <QMenuBar> 

int main(int argc, char *argv[]) 
{ 
QApplication::setAttribute(Qt::AA_MacPluginApplication); 
QApplication a(argc, argv); 
QApplication::setAttribute(Qt::AA_DontUseNativeMenuBar); 
MainWindow w; 
QMenuBar * menuBar = new QMenuBar(); 
menuBar->addMenu("File"); 
menuBar->addMenu("Edit"); 
w.setMenuBar(menuBar); 
menuBar->show(); 
w.show(); 

return a.exec(); 
}