insertTagNodeAbove method
Implementation
NodeV3 insertTagNodeAbove(Tag tag) {
int myIdx = parentIndex;
deleteFromTree();
NodeV3 nodeNew = NodeV3(
scopeStart,
scopeEnd,
tag: tag,
parent: parent,
);
parent!.addChild(nodeNew, myIdx);
nodeNew.addChild(this);
this.parent = nodeNew;
return nodeNew;
}