[Pidgin] #10078: Correct display of nick in IRC session.

[Pidgin]

#10078: Correct display of nick in IRC session.
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 Reporter:  chencho    |     Owner:  elb  
     Type:  defect     |    Status:  new  
Component:  IRC        |   Version:  2.6.1
 Keywords:  irc, nick  |  
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 When you change your nickname or someone in a channel do this, the nick
 remains as the old one.

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Ticket URL: <http://developer.pidgin.im/ticket/10078>
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