Regression: QComboBox doesn't display items correctly when layoutDirection is set to Qt::RightToLeft

#include <QApplication>

#if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
#include <QtWidgets>
#else
#include <QtGui>
#endif

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QMainWindow mainWindow;
    QComboBox comboBox(&mainWindow);
    comboBox.setLayoutDirection(Qt::RightToLeft);
    comboBox.addItem("Test1");
    comboBox.addItem("Test2");
    comboBox.addItem("Test3");
    comboBox.addItem("Test4");
    mainWindow.show();
    return app.exec();
}