(Oops.  Sent the previous mail too early.)

Mauro Aranda <maurooaranda@gmail.com> writes:

> How does the attached patch look? I didn't include changes for the rest
> of the escape sequences, because of Eli's objections.

Looks good.  The only thing that's confusing now is that if you delete
the char, it displays as \s?

M-x customize-variable RET whitespace-display-mappings RET