QListView have incorrect viewport rectangle when there is right to left language

When using QListView with non-zero viewport margins and IconMode - the translated viewport rectangle is incorrect in a case when right-to-left direction.

For example, execution setViewportMargins(50, 0, 0, 0); should provide left shifting when left-to-right direction. The margin should be from right side when righ-to-left direction. But it not. Is it correct behavior?

The suspicious code in QAbstractScrollAreaPrivate::layoutChildren() :

if (q->isRightToLeft())
        viewportRect.adjust(right, top, -left, -bottom);
    else
        viewportRect.adjust(left, top, -right, -bottom);

    viewport->setGeometry(QStyle::visualRect(opt.direction, opt.rect, viewportRect)); // resize the viewport last

There is unnecessary isRightToLeft checking and adjust operation.