Font Alignment issues on MacOSX 10.8.5

[BoBKelso]

Hi,
I need to use a different font than the default font on every Widget. But if I do the vertically alignment of the text seems to be wrong. I created an example to show you the issue:

Bildschirmfoto 2014-03-07 um 13.43.23.png

Here is the key code:

#include "mainwindow.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	a.setStyleSheet("*{ \n"
			"	font: 14px Helvetica;\n"
			"}");
	MainWindow w;
	w.show();
 
	return a.exec();
}

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

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	a.setStyleSheet("*{ \n"
			"	font: 14px Helvetica;\n"
			"}");
	MainWindow w;
	w.show();
	
	return a.exec();
}

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What am I doing wrong or how can I fix this issue? To me it looks like the font metrics are not calculated properly. (I know there was a similar issue on 10.9 even with the default font...)
BTW: I compiled my own version of Qt with the following config options:
-opensource -fontconfig

And this issue occurs with Qt 4.8.5 and 5.2

Thanks in advance
Timo