[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
Milestone:              |   Component:  IRC
  Version:  2.6.4       |  Resolution:
 Keywords:              |
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Comment (by mcepl):

 Just to note that I can happily reproduce this issue with
 pidgin-2.10.7-24.el7 against znc-1.4-1.el6.x86_64.

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Ticket URL: <https://developer.pidgin.im/ticket/11255#comment:2>
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