[Bug-readline] Issue with multibyte and non-visible characters in prompt

[Brian]

Hi,

I am running into an issue while trying the following program with
readline 7.0.003-1:

#include <stdio.h>
#include <readline/readline.h>

int main(int argc, char **argv) {
    char prompt[] = "\x1B[36;1m> \x1B[0m";

    printf("prompt length: %i\n", sizeof prompt);

    while (readline(prompt)) { }

    return 0;
}


If I type a long word and then try to delete it with ctrl-w like this:

> aaaaaaaaaaaaaaaaaaaaaaa^W

The result would be (being unable to clean the rest):

> aaaaaaaaaaa

Note that this have a length of 13 characters, the same size of PROMPT
(without \0). The actual content of the returned buffer is just an empty
string.


Thanks