[GHC] #9364: GHCi (or haskeline?) confused by non-single-width characters

[GHC]

#9364: GHCi (or haskeline?) confused by non-single-width characters
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        Reporter:  cheater           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  7.8.3
      Resolution:                    |             Keywords:  linux,
                                     |  terminal, colour, color, prompt
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #5850             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by cheater):

 Evan Laforge brought up the following fix on ghc-dev:

 ------------

 Here's what I use:

 :set prompt "\ESC[46m\STX%s>\ESC[39;49m\STX "

 I believe \STX is a signal to haskeline for control sequences.
 Documentation is here:
 https://github.com/judah/haskeline/wiki/ControlSequencesInPrompt

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9364#comment:5>
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