[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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Comment(by xnyhps):

 I've updated the patch, it now parses the "since" field first, and then
 makes a properly formatted string.

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Ticket URL: <http://developer.pidgin.im/ticket/10986#comment:4>
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