Submitted forms don't carry the "submitter" attribute

[paradox460]

Describe the bug

Phoenix gained the ability to distinguish between which submit button was clicked in phoenixframework/phoenix_live_view#2490. Unfortunately, this doesn't work with the default way surface handles form submit.

How to reproduce it

1. Create a form using <Form> components, with 2 submit buttons. Ensure the submit buttons have a name and value attribute set

   <Form
     for={@changeset}
     trigger_action={false}
     submit="submit"
     change="change"
   >
     <button type="submit" name="submit" value="submit">Submit</button>
     <button type="submit" name="submit" value="save">save</button>
   </Form>
   

2. Attempt to submit the form using either button. You will not see the submit as a value in the params map

The behavior you expected

I should see the submit value as either save or submit, depending on the button that was clicked. This is how it works in native Phoenix LiveView

Your Environment

Surface: v0.11.0
LiveView: v0.19.5
Elixir: 1.14.4-otp-25