QTextLayout::RetrieveStringIndexes seems broken for RTL texts

    QTextLayout layout("مرحبا بالعالم");

    layout.beginLayout();

    QTextLine line = layout.createLine();
    assert(line.isValid());

    line.setLineWidth(QFIXED_MAX);

    QList<QGlyphRun> runs = line.glyphRuns(-1,-1,QTextLayout::RetrieveStringIndexes);

    for (auto run : runs) {
        qDebug() << "string indexes: " << run.stringIndexes();
    }

//    string indexes:  QList(0, 0, 0, 0, 0, 0, 0)
//    string indexes:  QList(0)
//    string indexes:  QList(0, 1, 2, 3, 4)