[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):

 XEP-0186 support is pretty useless, as no server currently implements
 that.

 What's in active use and does not break the core RFC (unlike
 type='invisible') is to use privacy lists for invisibility. Every server
 supports that and nearly every client supports it either - I don't see why
 Pidgin should be an exception here. Plus we would FINALLY have a working
 Privacy Dialog for XMPP. It's a shame to have privacy lists for
 proprietary garbage like ICQ, but not for XMPP.

 For XEP-0018: Stay the hell away from it! It breaks the core RFC and thus
 has been rejected!

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Ticket URL: <http://developer.pidgin.im/ticket/4509#comment:9>
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