Please add node.indexInParent

In parallel with a GraphicNode’s parent field, it would be wildly useful to have an indexInParent field, so you could quickly clamber around tree structures without scanning a parent for the index of the node in question.

The indexInParent field would of course just be the node’s index in the parent node’s children.

With this, you would have the effect of sibling pointers like you have in an HTML DOM.

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