Eli Zaretskii <eliz@gnu.org> writes:

> I think both [:print:] and .* would be too radical, as I'm not sure
> including control characters and arbitrary whitespace will not break
> something.  But maybe [:graph:] is better than [:alnum:].
>
> In any case, I think we want a comment there saying that this is to
> allow more characters in file names shown in the prompt.

How about the attached patch?

Thanks,
Stefan Kangas