Re: [webcomponents] Need "slotting changed" event (#288)

@treshugart I wasn't suggesting an event-per-distributed-node, but rather an event-per-slot-element-distributed-to. I'd expect that MutationObserver wouldn't be able, in the common case, to provide much batching here, since each slot element would likely have a different MutationObserver observing it (owned by the custom element whose slot element is affected).

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