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

@JanMiksovsky : Do you want an event to detect when the "distributed" (i.e. after unwrapping / flattening slots) nodes are changed or when assigned nodes are changed?  Also, do you want this event be synchronous or asynchronous?

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https://github.com/w3c/webcomponents/issues/288#issuecomment-148892225