Re: [whatwg/xhr] Add optional submitter argument to FormData constructor (PR #366)

@jenseng commented on this pull request.



> @@ -1609,7 +1609,7 @@ typedef (File or USVString) FormDataEntryValue;
 
 [Exposed=(Window,Worker)]
 interface FormData {
-  constructor(optional HTMLFormElement form);
+  constructor(optional HTMLFormElement form, optional HTMLElement? submitter = null);

Ah here's a good justification for `requestSubmit` accepting null: https://github.com/whatwg/html/issues/3195#issuecomment-547475867

Similarly this could be useful for the `FormData` constructor, e.g. `SubmitEvent.submitter` could be null, and it would be nice to avoid null checks:

```javascript
myForm.addEventListener("submit", () => {
  const formData = new FormData(e.target, e.submitter);
  // ...
});
```

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