QDesktopWidget::availableGeometry() returns wrong value s under MacOS/X

Platform:

Mac OS X

Platform details:

Apple iMac
2.16 GHz Intel Core 2 Duo
2GB RAM

OS/X 10.6.1

Compilers:

GCC

Compiler details:
i686-apple-darwin10-g++-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5646)

Steps to reproduce / test case:

1) Compile and run the attached code
2) Note that the displayed window says "availableGeometry: left=0 top=0 width=1920 height=1100"
3) That is incorrect – it doesn't take into account area at the top of the screen where the mac's system-wide menu bar is. Expected behavior would be for it to say something like "availableGeometry: left=0 top=20 width=1920 height=1080"

This problem was reproduced in both the Cocoa and Carbon builds of Qt 4.6.1-beta for MacOS/X.

More information:

#include <stdio.h> 
#include <QApplication> 
#include <QDesktopWidget> 
#include <QLabel> 

class MyLabel : public QLabel 
{ 
public: 
MyLabel() 
{ 
setMinimumSize(500,100); 
setAlignment(Qt::AlignCenter); 
} 

virtual void showEvent(QShowEvent * e) 
{ 
QLabel::showEvent(e); 
QRect ag = qApp->desktop()->availableGeometry(); 
char buf[512]; 
sprintf(buf, "availableGeometry: left=%i top=%i width=%i height=%i\n", ag.left(), ag.top(), ag.width(), ag.height()); 
setText(buf); 
} 
}; 

int main(int argc, char ** argv) 
{ 
QApplication app(argc, argv); 

MyLabel lab; 
lab.show(); 
return app.exec(); 
}