[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 shreg):

 If invisibilty is not implemented for XMPP,
 it could be usefull to WARN the user that pidgin does not support
 invisibility when the user set invisibility ON.

 A message on top of the contact windows, "like the one for new email" for
 example.

 my 2 cents to this small bug in this great software

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Ticket URL: <http://developer.pidgin.im/ticket/4509#comment:15>
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