getSiblingRuntime method
Implementation
DOMNodeRuntime<T>? getSiblingRuntime(T? other) {
if (other == null || treeMap == null || !isInSameParent(other)) return null;
var otherDomNode = treeMap!.getMappedDOMNode(other);
return domGenerator.createDOMNodeRuntime(treeMap!, otherDomNode, other);
}