[Pidgin] #15446: Duplicate Jabber log messages (historic transcripts)

[Pidgin]

#15446: Duplicate Jabber log messages (historic transcripts)
------------------------+--------------------
 Reporter:  tomkiewicz  |      Owner:  deryni
     Type:  defect      |     Status:  new
Milestone:              |  Component:  XMPP
  Version:  2.10.6      |   Keywords:  muc
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 Related adium bug: #a14219 (fixed).
 Libpurple backend: #10986.

 When joining to XMPP MUC, we get (and display) all history that server
 sends us, even, if we displayed it previously. Pidgin should request only
 history since date of the last message, that was got (or sent) in certain
 chat.

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Ticket URL: <https://developer.pidgin.im/ticket/15446>
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