after one (large-distance) mouse move event, DragHandler.translation is still zero

void QQuickDragHandler::handlePointerEventImpl(QQuickPointerEvent *event)
{
    QQuickMultiPointHandler::handlePointerEventImpl(event);
    event->setAccepted(true);

    if (active()) {
        // Calculate drag delta, taking into account the axis enabled constraint
        // i.e. if xAxis is not enabled, then ignore the horizontal component of the actual movement
        QVector2D accumulatedDragDelta = QVector2D(m_centroid.scenePosition() - m_centroid.scenePressPosition());
        if (!m_xAxis.enabled())
            accumulatedDragDelta.setX(0);
        if (!m_yAxis.enabled())
            accumulatedDragDelta.setY(0);
        setTranslation(accumulatedDragDelta);
    } else {
...