[w3c/payment-request] Clarification question for `show()` algorithm (#820)

**TL;DR:** Can `show()` be called on the same instance of `PaymentRequest` multiple times?

The `show()` algorithm includes the following steps:

> 6. If *request*.[[state]] is not "created" then return a promise rejected with an "InvalidStateError" DOMException.
> 7. If the user agent's "payment request is showing" boolean is true, then return a promise rejected with an "AbortError" DOMException.
> 8. Set *request*.[[state]] to "interactive".

It looks like `show()` can be rejected without altering the *request*.[[state]], so the merchant can call `show()` on the same instance of `PaymentRequest`. Is this the only edge case where `show()` does not change state? Or am I reading the spec wrong?

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