Re: [whatwg/dom] Fix NodeIterator pre-remove steps for ancestors of root (PR #1477)

annevk left a comment (whatwg/dom#1477)

While adding companion test coverage in web-platform-tests/wpt#60997, I exercised the pre-remove step-2 branch that the existing parametric WPT test never reached (it only drives iterators forward with \`nextNode()\`). One of the new tests — removing an inclusive ancestor of the reference, with \`pointerBeforeReferenceNode\` true and no following node within root — exposes an interop bug:

| Engine | Behavior |
| ------ | -------- |
| Firefox | Matches the spec: pointer flips to \`false\`, reference moves to the last inclusive descendant of the removed node's previous sibling. |
| Chrome  | Leaves the reference pointing at the now-detached node. |
| Safari  | Same as Chrome. |

Filing as a heads-up; not a blocker for this PR. The spec is unambiguous about this case both before and after the fix here.

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