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

[Pidgin]

#15508: Support for XEP-0280: Message Carbons
-------------------------+---------------------------------
 Reporter:  xnyhps       |      Owner:  deryni
     Type:  enhancement  |     Status:  new
Milestone:               |  Component:  XMPP
  Version:  2.10.6       |   Keywords:  xmpp carbons jabber
-------------------------+---------------------------------
 I think it would be great if libpurple supported
 [[http://xmpp.org/extensions/xep-0280.html|XEP-0280: Message Carbons]]. It
 would make scenarios with multiple clients logged in at once much easier
 to handle.

 I'm attaching a patch that implements support for this in libpurple. It
 adds a new menu item to any XMPP account that is logged in and where the
 server has indicated it supports Carbons (I think this is less confusing
 than adding a setting to the account's preferences that many servers won't
 support), allowing the user to toggle carbons on or off (if it had
 previously been set to on, it will enable it automatically when logging
 in).

 The XEP's status is still Experimental, so I don't think Pidgin will add
 it yet, but it's good to have the code exist, in my opinion.

 UIs will still need to be updated to support it: I think many of them
 don't properly handle {{{PURPLE_MESSAGE_SEND}}}.

 (I'm opening a new ticket instead of updating #14663, as that one
 specifically requests it for GTalk, which currently uses a custom
 extension to do this.)

-- 
Ticket URL: <https://developer.pidgin.im/ticket/15508>
Pidgin <http://pidgin.im>
Pidgin