Font size fails

I allowed bitmap fonts with fontconfig
Helvetica font is available in pcf files

A short example:

#include <QApplication>
#include <QFont>
#include <QFontInfo>
#include <QDebug>

int main(int argc, char **argv)

{ QApplication a(argc, argv, false); QFont font10; font10.fromString("Helvetica,10,-1,5,50,0,0,0,0,0"); QFont font12; font12.fromString("Helvetica,12,-1,5,50,0,0,0,0,0"); QFontInfo finfo10(font10); QFontInfo finfo12(font12); qDebug() << "Fontsize: " << font10.pointSize() << " -> " << finfo10.pointSize(); qDebug() << "Fontsize: " << font12.pointSize() << " -> " << finfo12.pointSize(); }

Output of program should be:
Fontsize: 10 -> 10
Fontsize: 12 -> 12

Instead the output of program:
Fontsize: 10 -> 12
Fontsize: 12 -> 10

10 pt QFont creates a 12 pt QFontInfo and
12 pt QFont creates a 10 pt QFontInfo...

Is it normal?

Though if the QApplication is created without GUI (3rd argument is 'false') the output seems right.