[Pidgin] #4509: Support XMPP Invisibility

[Pidgin]

#4509: Support XMPP Invisibility
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 Reporter:  js      |        Owner:  deryni
     Type:  defect  |       Status:  new   
Milestone:          |    Component:  XMPP  
  Version:  2.3.1   |   Resolution:        
 Keywords:          |  
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Comment(by js):

 Oh, plus we use privacy lists for invisibility in ICQ as well. So it's not
 an argument that using privacy lists for that might be hacky.

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Ticket URL: <http://developer.pidgin.im/ticket/4509#comment:10>
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