[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:  judah   
    Type:  defect  |       Status:  assigned
Priority:  minor   |    Milestone:          
 Version:  0.6     |   Resolution:          
Keywords:          |  
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Comment (by guest):

 With pleasure `:-)`. #111

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Ticket URL: <http://trac.haskell.org/haskeline/ticket/78#comment:11>
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