broken QIcon (from QPainter) in VS2010 Release

[ctgrund]

For the following code I get a nice icon in debug but a wrong icon in release mode. It is a stripped version originating in a QAbstractItemModel application.

Windows XP, Qt 4.8.4, Visual Studio 2010

Debug:Icon1.png

Release: Icon2.png

Thank you!

#include <QApplication>
#include <QPainter>
#include <QMainWindow>
 
QIcon icon() {
   QPixmap Icon(16,16);
   QPainter Painter(&Icon);
   Painter.drawLine(0,7,15,7);
   return Icon;
}
 
int main(int argc, char *argv[]) {
   QApplication Application(argc, argv);
   QMainWindow Window;
   Application.setWindowIcon(icon());
   Window.show();
   return Application.exec();
}

#include <QApplication>
#include <QPainter>
#include <QMainWindow>

QIcon icon() {
   QPixmap Icon(16,16);
   QPainter Painter(&Icon);
   Painter.drawLine(0,7,15,7);
   return Icon;
}

int main(int argc, char *argv[]) {
   QApplication Application(argc, argv);
   QMainWindow Window;
   Application.setWindowIcon(icon());
   Window.show();
   return Application.exec();
}

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