Ville Lindholm 8cfb6e33fe XPath: implement lang() and id() core functions (#34594) ...

XPath's `lang()` and `id()` functions were still unimplemented.

Also:
* Add WPT tests for `id()`.
* Fix uniqueness check in `NodesetHelpers::document_order_unique`.
* Tweak the AST a bit to make it clearer to express "no predicates".
* Fix a parsing bug where "/" was attempted before "//", leaving the
"//" branch as always unused.

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #34593 
- [x] There are tests for these changes

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Signed-off-by: Ville Lindholm <ville@lindholm.dev>

2025-06-02 19:00:13 +00:00

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