[Pidgin] #15458: Avoid duplicate MUC history messages

[Pidgin]

#15458: Avoid duplicate MUC history messages
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 Reporter:  Kha                  |       Owner:
     Type:  enhancement          |      Status:  new
Milestone:                       |   Component:  pidgin (gtk)
  Version:                       |  Resolution:
 Keywords:  muc history backlog  |
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Comment (by Robby):

 Thanks for the patch. :)

 The issue was previously reported in #15446.

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Ticket URL: <https://developer.pidgin.im/ticket/15458#comment:1>
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