[issue10287] NNTP authentication should check capabilities

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Hynek, the patch doesn't apply properly here. Are you soon it's been generated against an up-to-date working copy?

Also, I think the logic is wrong: the capabilities should *always* be queried after auth, even if they are already known. That's because they can change after auth is successful.

See RFC 4643: “Other capabilities returned in response to a CAPABILITIES
   command received after authentication MAY be different from those
   returned before authentication.  For example, an NNTP server may not
   want to advertise support for a specific extension unless a client
   has been authenticated.”

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