logic in AutofillAgent could be tricky.I'd love to hear if you have any better ideas on how to do this, or thoughts on autofill in general in the case that we are using <datalist> for rendering as a popover instead of suggestions that are just passed to autofill.
For some more context, autofill controls the rendering of the "native" datalist and in some situations may combine its own suggestions with the ones provided by the datalist in the page. Here's an example where autofill puts the page's datalist suggestions and then my own email within one picker (the input is not even in a form element):
```
<input name=email list=datalist>
<datalist id=datalist>
<option>one</option>
<option>two</option>
</datalist>
```
https://screenshot.googleplex.com/C7AN9uDL8ep4JiG
imo, in the case where the site is making a combobox with this new feature and has its own options to autocomplete with, then we shouldn't bother trying to autofill it, which is why I implemented this patch to do so.
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