[Pidgin] #12926: prpl-jabber assumes <session xmlns='...xmpp-session'/> stream feature is supported

[Pidgin]

#12926: prpl-jabber assumes <session xmlns='...xmpp-session'/> stream feature is
supported
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 Reporter:  wjt     |     Owner:  deryni
     Type:  defect  |    Status:  new   
Component:  XMPP    |   Version:  2.7.5 
 Keywords:          |  
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 prpl-jabber doesn't pay any attention to whether <stream:features>
 contains <session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>, but just
 always sends a session establishment IQ (if resource binding succeeds). My
 reading of http://xmpp.org/rfcs/rfc3921.html#session is that it's
 optional, so jabber_stream_features_parse() should check for this feature,
 stash whether it's supported in the JabberStream, and consult the stashed
 value in jabber_bind_result_cb() rather than always calling
 jabber_session_init(js).

 (Sorry, don't have time to actually implement and test this right now. :))

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Ticket URL: <http://developer.pidgin.im/ticket/12926>
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