Scope parameter forgotten if "me" is not included

[tomlarkworthy]

If the "me" parameter is not included the site will serve the sign_in chooser at the beginning of the auth flow and then redirect the user back to /auth. However, after the user chooses their identify URL in sign_in the original scope parameter is not forwarded.

If "me" is nil hydrate signin-form

https://github.com/aaronpk/IndieAuth.com/blob/main/controllers/auth-web.rb#L188

2. If me is not nil read the "scope" param

https://github.com/aaronpk/IndieAuth.com/blob/main/controllers/auth-web.rb#L217

3. Note: the signing form does not have a scope parameter

IndieAuth.com/views/sign_in.erb

Line 5 in d642e1e

<form action="<%= SiteConfig.root %>/auth" method="get" class="well" style="margin: 20px 0;">

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