[w3c/webcomponents] When is `slotchange` handler fired? (#515)

When is `slotchange` handler fired in these cases?

- A is appended into B, and B already has a shadow dom so therefore A gets distributed into a slot inside of `B`, and finally the `slotchange` event handlers are called. Will the code in the `slotchange` handlers be called in the same tick as when A's `connectedCallback` is called? If so, then [I can deferr a to a future tick in order to catch the case that a parent `motor-node` has not made a connection with a distributed `motor-node`](https://github.com/w3c/webcomponents/issues/504#issuecomment-224099588).

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