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81d6990263
My optimization for PreorderNodeIterator has a bug that would cause an attempt
to access stack[-1] in
currentParent = (current == null) ? null : stack[stackTop - 1];
when current refers to a start node sibling. This is not visible in Rhino because
currently PreorderNodeIterator is always started from nodes with node.next == null.
iter.diff fixes that plus it removes currentParent field because it is always
available as stack[stackTop - 1] and code to access its value are executed less
frequently than the lines to update it in nextNode
Regarsd, Igor
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