QComboBox, RightToLeft layout direction, brackets - incorrect behaviour

[napajejenunedk0]

#include <QtGui/QApplication>
#include <QComboBox>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    QComboBox cb;
    cb.setLayoutDirection( Qt::RightToLeft );
    cb.addItem( "Abc" );
    cb.addItem( "Abc (Abc)" );
    cb.addItem( "(Abc)" );
    cb.addItem( "(Abc) Abc" );
    cb.addItem( "()" );
    cb.addItem( "a (a) a" );
    cb.show();
 
    return a.exec();
}

#include <QtGui/QApplication>
#include <QComboBox>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QComboBox cb;
    cb.setLayoutDirection( Qt::RightToLeft );
    cb.addItem( "Abc" );
    cb.addItem( "Abc (Abc)" );
    cb.addItem( "(Abc)" );
    cb.addItem( "(Abc) Abc" );
    cb.addItem( "()" );
    cb.addItem( "a (a) a" );
    cb.show();

    return a.exec();
}

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Create an empty Qt Gui application project and run the code above.
Note that if the braces are positioned in ends of the text (in a combobox item) the braces are somehow messed up.

Is this a QComboBox bug?

Searched the forum for a similar problem but found nothing.