mask_verdict_userinfo's character class [^@]* crossed a '/' or a space, so a
verdict line with a URI that has no userinfo plus a later @ (e.g. an email
address in diagnostic prose) had everything between them destroyed. Restrict
the class to [^@/[:space:]]* so the match stops at the end of the URI.
Adds the uncovered-direction test: a URI with no userinfo plus a later @ in
the same line must pass through byte for byte. Also drops the design-rationale
sentence from the helper's comment (now in the PR description).
Dai Ha
5f5d16fbd4