[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:  enhancement          |      Status:  new
Milestone:                       |   Component:  XMPP
  Version:  2.10.6               |  Resolution:
 Keywords:  xmpp carbons jabber  |
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Comment (by xnyhps):

 My rationale to make it a menu item instead of a field on the account's
 preferences was that the possibility of enabling it depends on wether the
 server supports it.

 I think it would be even more confusing to have a "Enable message copies"
 in the account's preferences which does nothing on 90% of the servers. In
 general the account preferences seem to be static, and anything depending
 on server support is added as a menu item.

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Ticket URL: <https://developer.pidgin.im/ticket/15508#comment:5>
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