[Mutt] #3304: ungroup not implemented

[Mutt <fleas@xxxxxxxx>]

#3304: ungroup not implemented
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 Reporter:  pdmef   |       Owner:  mutt-dev
     Type:  defect  |      Status:  new     
 Priority:  major   |   Milestone:  1.6     
Component:  mutt    |     Version:  1.5.20  
 Keywords:          |  
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 Though advertised in the manual, the `ungroup` command isn't implemented.

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Ticket URL: <http://dev.mutt.org/trac/ticket/3304>
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