ansi escape sequences in prompt mess-up the command prompt

[Antonis]

GNU bash, version 3.00.16(1)-release (i686-pc-linux-gnu)

Using ansi escape sequences in the prompt causes Bash to incorrectly
calculate the available width of the terminal and messes-up the command
prompt when a certain amount of characters are typed in.

For example type in a terminal the following:

PS1='\e[1;33m\h\e[0m \$ '

in this prompt there are two escape sequences that should consume zero
characters out of the available width of the command line. But they
consume 11 characters in total (the first escape sequence 7 characters
and  the second 4).

Now start typing characters in the command prompt. The command line
will get messed-up 11 characters before reaching the end of the line.


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