nextSibling static method
Gets the next sibling of a specified node within its parent's child list
Implementation
static LatexNode? nextSibling(LatexNode parent, LatexNode child) {
final children = childrenOf(parent);
final index = children.indexOf(child);
return (index >= 0 && index < children.length - 1)
? children[index + 1]
: null;
}