[Pidgin] #17417: Merge chats the way buddies can be merged

[Pidgin]

#17417: Merge chats the way buddies can be merged
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 Reporter:  brian_j_murrell  |      Owner:
     Type:  enhancement      |     Status:  new
Milestone:                   |  Component:  libpurple
  Version:  2.13.0           |   Keywords:
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 It's really cool how buddies can be merged so that multiple protocol
 accounts can be collated into a single buddy.

 The parallel for chats doesn't seem to exist though.  I can have the same
 contacts in a group chat on separate protocols but I cannot seem to merge
 those the way I can with buddies.

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Ticket URL: <https://developer.pidgin.im/ticket/17417>
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