Added the Garden.SignIn.Popup setting to the advanced embedding settings.
Stash the comment on GET and not just POST.
Use -sid instead of SessionID for the cookie name.
Use the parent url for the redirect url on embedded comments rather than the current one. Also target _top on the embedded comments.
Make sure the session stash has completed before navigating to the embed comment sign in url.
Merge pull request #1817 from vanillaforums/hotfix/comment-sso

Embedded Comments SSO