Re: [w3c/webcomponents] flatten: true in assignedNodes doesn't make much sense when a slot doesn't have display: contents (#493)

In addition, when a slot is wrapped another element, e.g. span, it continues to function as a slot.  As an example, consider the following tree:
```
div --------- shadow-root
 + slot A      + slot C
 + span
    + slot B
```

slot C has two assigned nodes: slot A and span.  But span also contains slot B.  It's not clear as to why slot A needs a special treatment of being unwrapped just because it happens to be a direct child of the shadow host.

Or perhaps the importance is that it's a direct child of a slot?

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