[haskeline] #78: control characters in prompt mess up width calculations

[haskeline]

#78: control characters in prompt mess up width calculations
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Reporter:  judah   |        Owner:     
    Type:  defect  |       Status:  new
Priority:  minor   |    Milestone:     
 Version:  0.6     |   Resolution:     
Keywords:          |  
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Comment (by phercek):

 Right, \[ and \] look better. It would work only for zero length control
 codes but that is enough. I like it more than defining the length in
 .haskeline.

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Ticket URL: <http://trac.haskell.org/haskeline/ticket/78#comment:3>
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