[whatwg/dom] Fix composedPath() once more (#696)

The existing algorithm exposed nodes in shadow trees that should remain hidden. (This wasn't noticed in #535.)

This changes "get the parent" to return a tuple and therefore requires downstream changes in at least Indexed DB.

Tests: ...

Fixes #684.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/696

-- Commit Summary --

  * Fix composedPath() once more

-- File Changes --

    M dom.bs (216)

-- Patch Links --

https://github.com/whatwg/dom/pull/696.patch
https://github.com/whatwg/dom/pull/696.diff

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