empty node does not clear the parent of chidren

[xzer]

some source like following:

List children = parent.childrenNodes();
parent.empty();

for(Node node:children){
otherParent.appendChild(node);
}

the above source will throw a IndexOutOfBoundsException because the pre retrieved children nodes' parent is not null, further more, after I empty the parent node, node.remove() will throw the same exception due to the same reason.

I think the empty method should clear all its children's parent reference.

[jhy]

I've added a new method, Element#insertChildren(index, children), to make this simpler. You do not need to empty() the previous parent. If you do, the children will be emptied as well (because that list is backed by the parent list).

To move append successfully:

List<Node> children = parent.childNodes();
otherParent.insertChildren(-1, children);