[Pidgin] #15508: Support for XEP-0280: Message Carbons

[Pidgin]

#15508: Support for XEP-0280: Message Carbons
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 Reporter:  xnyhps                  |       Owner:  deryni
     Type:  patch                   |      Status:  new
Milestone:  Patches Needing Review  |   Component:  XMPP
  Version:  2.10.6                  |  Resolution:
 Keywords:  xmpp carbons jabber     |
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Comment (by shtrom):

 I confirm the need for better Message Carbons support in the case of OTR.
 At the moment, OTR messages from Pidgin are delivered to all clients
 (Gajim + Conversations in my case), and some notification noise ensues.
 Apparently due to carbons not being disabled for OTR messages at the
 sender [0].

 [0]
 https://github.com/siacs/Conversations/issues/1275#issuecomment-123270047

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Ticket URL: <https://developer.pidgin.im/ticket/15508#comment:43>
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