Group commenting--check BEFORE posting, or give the user a chance to login

When commenting in a group, I entered a comment, then clicked "submit". The response was: "You do not have permission to post to this group."

Along with this message, please display the comment I submitted (now I have to retype it elsewhere, once I remember what it was)!

So, ideally, check before the user enters text in the comment filed, or give them a chance to login/switch logins.

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