AnchorLine QmlAnchors::instanceAnchor(AnchorLine::Type sourceAnchorLine) const
{
    QPair<QString, NodeInstance> targetAnchorLinePair;
    if (qmlItemNode().nodeInstance().hasAnchor("anchors.fill") && (sourceAnchorLine & AnchorLine::Fill)) {
        targetAnchorLinePair = qmlItemNode().nodeInstance().anchor("anchors.fill");
        targetAnchorLinePair.first = lineTypeToString(sourceAnchorLine);
    } else if (qmlItemNode().nodeInstance().hasAnchor("anchors.centerIn") && (sourceAnchorLine & AnchorLine::Center)) {
        targetAnchorLinePair = qmlItemNode().nodeInstance().anchor("anchors.centerIn");
        targetAnchorLinePair.first = lineTypeToString(sourceAnchorLine);
    } else {
        targetAnchorLinePair = qmlItemNode().nodeInstance().anchor(anchorPropertyName(sourceAnchorLine));
    }

    AnchorLine::Type targetAnchorLine = propertyNameToLineType(targetAnchorLinePair.first);

    if (targetAnchorLine == AnchorLine::Invalid )
        return AnchorLine();

    Q_ASSERT(targetAnchorLinePair.second.isValid());
    return AnchorLine(QmlItemNode(qmlItemNode().nodeForInstance(targetAnchorLinePair.second)), targetAnchorLine);
}
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AnchorLine QmlAnchors::instanceAnchor(AnchorLine::Type sourceAnchorLine) const
{
    QPair<QString, qint32> targetAnchorLinePair;
    if (qmlItemNode().nodeInstance().hasAnchor("anchors.fill") && (sourceAnchorLine & AnchorLine::Fill)) {
        targetAnchorLinePair = qmlItemNode().nodeInstance().anchor("anchors.fill");
        targetAnchorLinePair.first = lineTypeToString(sourceAnchorLine); // TODO: looks wrong
    } else if (qmlItemNode().nodeInstance().hasAnchor("anchors.centerIn") && (sourceAnchorLine & AnchorLine::Center)) {
        targetAnchorLinePair = qmlItemNode().nodeInstance().anchor("anchors.centerIn");
        targetAnchorLinePair.first = lineTypeToString(sourceAnchorLine);
    } else {
        targetAnchorLinePair = qmlItemNode().nodeInstance().anchor(anchorPropertyName(sourceAnchorLine));
    }

    AnchorLine::Type targetAnchorLine = propertyNameToLineType(targetAnchorLinePair.first);

    if (targetAnchorLine == AnchorLine::Invalid )
        return AnchorLine();

    if (targetAnchorLinePair.second < 0) //there might be no node instance for the parent
        return AnchorLine();

    return AnchorLine(QmlItemNode(qmlItemNode().nodeForInstance(qmlItemNode().qmlModelView()->nodeInstanceView()->instanceForId(targetAnchorLinePair.second))), targetAnchorLine);
}