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

After discussing with @JanMiksovsky in person today, I'm pretty convinced that we need to add this event.  I think the question is the timing (sync vs. async vs. end-of-mirotask/nanotask) as well as the name.  I would like to stay away from the term "distribution" as much as possible.

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https://github.com/w3c/webcomponents/issues/288#issuecomment-157261248