message: Rebuild tree-update algo to work with new DIrectoryNode concepts.
diff: @@ -355,7 +355,7 @@ export class DummyDisposable {
  export function lexicographicalCompare(a: Iterable<string>, b: Iterable<string>): number {
  const a_iter = a[Symbol.iterator]();
  - const b_iter = a[Symbol.iterator]();
  + const b_iter = b[Symbol.iterator]();
  while (1) {
  const a_res = a_iter.next();
  const b_res = b_iter.next();
  