Re: [w3c/webcomponents] Method for detecting finally-distributed nodes. (#611)

@hayatoito Not with closed trees.

In a tree of node trees where all the trees are mode open, it is possible to implement `slot.distributedNodes()` like so:

- Let `slot` be the context object.
- If (slot.assignedSlot)
  - return []
- else
  - return slot.assignedNodes({flatten:true})

Basically, if the slot is assigned, then obviously nodes aren't finally distributed there. Only a final distribution point returns anything.

This doesn't work with closed trees obviously; that's where I'm currently having trouble figuring out the least hacky way to accomplish this.

An official method for this would be nice because we wouldn't need to make a hack when dealing with the closed trees.

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