Bug with colored prompt

[bchretien]

Hi!

I had the need to disable the colored prompt because of the following bug: using ctrl + A to go to the beginning of the line "fails" when using a colored prompt. It instead goes to an offsetted position (probably because of the color escape codes) and modifying the line becomes quite tedious. Then scrolling up to the previous command and down again to get an empty prompt also leads to an offsetted prompt that can't be fully erased:

Sorry for the obfuscated description ;-) I don't know if this is easily soluble, but the least I could do was report it.