Email provider does not work in a popup

when setting the option `signInFlow: 'popup'`, it works properly for Facebook and Google authentication, but does not work for email authentication. I am instead redirected to `https://www.accountchooser.com/redirect.html#localhost:3000`

Start by reproducing the issue with signInFlow set to 'popup', comparing email authentication with the working Facebook and Google flows. Trace why email authentication redirects to accountchooser.com instead of opening the popup; done means email sign-in remains in the popup flow without that redirect.

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