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

@sorvell , thanks! I understand the the notification must be for changes to distributed nodes.

Let me raise the priority of this feature request. I need some time to make a proof of a concept in Blink to support this feature in an efficient way before having a final spec.

> Anyway, this O(k) runtime/memory cost is precisely the reason we didn't want to support detecting changes to the list of distributed nodes but if all JS libraries are going to implement themselves, it would be MUCH worse

Yeah, I totally agree. We do not want JS libraries to implement this. It would be MUCH worse.


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