Re: [w3c/screen-orientation] Resolving the promise after the change event is fired (#147)

@mounirlamouri wrote
> Is there a recommended pattern by the TAG or commonly used one from other specifications?

I was actually thinking of filing a bug on the TAG as this particular situation is not _exactly_ covered by either the API Design Guide or the Promises Guide.  

Regardless, the "pending promise" effectively represents the screen having changed:

```JS
const pendingPromise = new Promise(r => {
  screen.orientation.addEventListener("change", ()=> r(), { once: true });
});
```


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