[GHC] #2945: trace history should be global or add command :mergetrace

[GHC]

#2945: trace history should be global or add command :mergetrace
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    Reporter:  phercek           |        Owner:                  
        Type:  feature request   |       Status:  new             
    Priority:  normal            |    Milestone:  6.12 branch     
   Component:  GHCi              |      Version:  6.10.1          
    Severity:  normal            |   Resolution:                  
    Keywords:  debugger          |   Difficulty:  Unknown         
    Testcase:                    |           Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |  
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Changes (by igloo):

  * difficulty:  => Unknown
  * milestone:  => 6.12 branch

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2945#comment:3>
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