[dom] Fix #146: Only run adopting steps when changing documents (#151)

This doesn't change the rest of the "adopt" steps.

dom.html not included.

Issue: #146
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/151

-- Commit Summary --

  * Fix #146: Only run adopting steps when changing documents

-- File Changes --

    M dom.bs (6)

-- Patch Links --

https://github.com/whatwg/dom/pull/151.patch
https://github.com/whatwg/dom/pull/151.diff

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https://github.com/whatwg/dom/pull/151