[Qt 5 regression] OS X / QMacStyle : PE_IndicatorBranch doesn't honor Qt::RightToLeft option

QMacStyle::drawPrimitive(QStyle::PE_IndicatorBranch, ...) doesn't honor Qt::RightToLeft option. Using Qt 4.8.6 if you use Qt::RightToLeft on a closed disclosure triangle, it draws the arrow pointing right to left. This appears to have been forgotten in Qt 5.

See qmacstyle_mac.mm, QMacStyle::drawPrimitive(). In Qt 4.8.6:

    case PE_IndicatorBranch: {
     ... 
        if (opt->state & State_Open)
            bi.value = kThemeDisclosureDown;
        else
            bi.value = opt->direction == Qt::LeftToRight ? kThemeDisclosureRight : kThemeDisclosureLeft;

The same case in Qt 5.4.0 lacks anything like this.

I have tested Qt 5.4.0, and I don't know about earlier versions.