[GHC] #9138: Allow users to edit their own tickets

[GHC]

#9138: Allow users to edit their own tickets
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       Reporter:  nomeata           |             Owner:  hvr
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Trac & Git        |           Version:  7.8.2
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 Non-power-users can edit their own comments, but not their tickets. That
 is annoying when one makes mistakes in the syntax. There is a history of
 changes, so it really wouldn't be a problem to allow that.

 The required permissions according to [TracPermissions] seems to be
 `TICKET_EDIT_DESCRIPTION`. `TICKET_EDIT_CC` would also be useful (#8881),
 as I can put people on CC when I create a ticket, but I cannot change that
 later.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9138>
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