Re: [dom] Fix the adoption step when replacing node by child into parent (#121)

@smaug---- That being said, here is what the step 11 would like with the behaviour you want:

> * If child’s parent is null, let removedNodes be the empty list. [Note: The above can only happen if child is node.]
> * Otherwise, remove child from its parent with the suppress observers flag set and let removedNodes be a list containing solely child.

I still consider my patch to be cleaner and a better representation of what happens to the DOM.

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