[Pidgin] #4509: Support XMPP Invisibility

[Pidgin]

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

 @ayanc: +1 for the invisibility v. dnd. dnd is mostly ignored.

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Ticket URL: <http://developer.pidgin.im/ticket/4509#comment:48>
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