[Pidgin] #7732: Updated XMPP User Avatar support

[Pidgin]

#7732: Updated XMPP User Avatar support
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 Reporter:  darkrain42            |        Owner:  deryni
     Type:  patch                 |       Status:  new   
Milestone:                        |    Component:  XMPP  
  Version:  2.5.2                 |   Resolution:        
 Keywords:  jabber, xmpp, avatar  |  
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Comment(by paul at darkrain42.org):

 (In [d70cdd1fd161f70a868170d8a72eadfbecfc966c]):[[BR]]
 Only (re)publish XMPP avatars at login if the server's avatar differs

 As part of this, no longer rely on the vcard for determining a need to
 publish the XEP-0084 avatar; explicitly fetch and compare it.

 Closes #7734.
 References #7732. That patch needs updating to apply on top of this.

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Ticket URL: <http://developer.pidgin.im/ticket/7732#comment:5>
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