Re: [w3c/webcomponents] Need "slotchange" event (#288)

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})

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