[Pidgin] #11255: Pidgin opens identical second tab if server sends JOIN without PART first.

[Pidgin]

#11255: Pidgin opens identical second tab if server sends JOIN without PART first.
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 Reporter:  CShadowRun  |     Owner:  elb  
     Type:  defect      |    Status:  new  
Component:  IRC         |   Version:  2.6.4
 Keywords:              |  
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 If the server sends JOIN twice, you end up with 2 channels tabs, on the
 same network, with the same name.

 Example:
 I am using the ZNC bouncer, sitting on #test.
 ZNC gets disconnected from the IRC network.
 ZNC reconnects to the IRC network.
 ZNC re-joins #test.
 Pidgin shows 2 tabs for #test, both look identical.
 I've attached a raw log of this.

 Expected behaviour:
 Pidgin should not open another tab, and instead use the existing tab.

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Ticket URL: <http://developer.pidgin.im/ticket/11255>
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