1 Display text/x-diff with the internal viewer, see upstream bug
2 http://bugs.mutt.org/3246
11 if (!ascii_strcasecmp ("plain", m->subtype) ||
12 - !ascii_strcasecmp ("rfc822-headers", m->subtype) ||
13 - !ascii_strcasecmp ("enriched", m->subtype))
15 + !ascii_strcasecmp ("rfc822-headers", m->subtype) ||
16 + !ascii_strcasecmp ("enriched", m->subtype) ||
17 + !ascii_strcasecmp ("x-diff", m->subtype))