Re: [w3c/webcomponents] [feature request] change when upgrade/connected happens during parsing, so that it is the first event in the following microtask (#787)

@rniwa It keeps getting more complicated: now if we create an instance with `new`, f.e. `new TestElement`, then add children to it but avoid calling `childConnectedCallback` because `isConnected` is false, then we have to somehow ensure that when the element is connected we'll fire `childConnectedCallback` for its children.

Now we're back at square one again, trying to do the same thing we couldn't do before without a macrotask! So if we want to fire `childConnectedCallback` initially for the element's children in `connectedCallback` because `isConnected` being `false` prevented us from firing it before connecting, then we have no choice but to use `setTimeout`!

Is there another way?

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