[Pidgin] #10986: Support XMPP MUC history backlog control

[Pidgin]

#10986: Support XMPP MUC history backlog control
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 Reporter:  Zash         |        Owner:  deryni
     Type:  enhancement  |       Status:  new   
Milestone:  2.7.11       |    Component:  XMPP  
  Version:  2.6.4        |   Resolution:        
 Keywords:  muc history  |  
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Changes (by darkrain42):

  * milestone:  => 2.7.11


Comment:

 Both deryni and I have given this a quick pass in the MUC.

 My one open question (and I'm leaning toward 'no') is whether we should
 try validating the passed-in values (mostly 'since' as a dateTime).

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Ticket URL: <http://developer.pidgin.im/ticket/10986#comment:3>
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