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

So you want to fire `slotchange` event when a slot element is newly inserted into a shadow root or removed from a shadow root?  I'm not sure if that makes sense.  The event I implemented in WebKit wouldn't get fired in those cases.

> So when those happen we need to "result" a bit and I guess we'd simply check whether an element was already assigned somewhere and if it remains assigned to the same slot it doesn't count as a change.

That sounds right.  You DO need to recursively check `assignedSlot`'s `assignedSlot`if it's not null as we're affecting the distributed nodes of all those slot elements.  For example, if I inserted a node N under a shadow root R1 with a slot element S1, and we realize that N is now newly assigned to S1.  Then, that could affect the distributed nodes of another slot element S2 to which S1 had been assigned.  If there is such a slot S2, we'd check whether S2 is assigned to another slot for the same reason, and so on and so forth.

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