Long standing annoying issue in ghci

[cheater00 cheater00]

Hi guys, this one seems to have gotten buried under more important
things, but maybe someone would like to take a look at it none the
less? I've been encountering it literally every day for the last 4
years. I sometimes find it difficult to find read the past commands
without color coding the prompt so I can't really turn it off. It
seems like a simple arithmetic issue somewhere in the readline
implementation.

https://ghc.haskell.org/trac/ghc/ticket/9364

Thanks a lot.