Hi again Matt:

In message <1568908191.0.0.280891749173.issue2551060@roundup.psfhosted.org>,
Matt writes:
>pre {
>  white-space: pre-wrap;
>}
>
Looks like this was added in:

  changeset:   4862:7ed1893ea3ac
  user:        Thomas Arendsen Hein <thomas>
  date:        Tue Mar 11 10:13:58 2014 +0100
  files:       CHANGES.txt share/roundup/templates/classic/html/style.css share/ro
  description:
  issue2550793: Wrap messages with very long lines in the web interface.

  Applied to templates classic, devel, minimal and website/issues.
  jinja2 and responsive should already have this through bootstrap.

so it's been there since 1.5.1.