Re: [webcomponents] Composition Algorithm shouldn't unwrap slots (#308)

Where would the distributed nodes be projected?

It would be problematic if they are projected inside the `<slot>`. In that case one couldn't, for example, project elements into an element that has `display: flex`.

```
<x-b>
  SR
    <x-a style="display: flex;"><slot></slot></x-a>
  <div>flex item?</div>
```

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