https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64968
--- Comment #17 from Frédéric Buclin <LpSolit at netscape dot net> --- Patch applied. Mikael, the next time you upload a f90 script, Bugzilla will correctly detect it as text/plain. Note that it won't convert the MIME type of already uploaded attachments (which you can manually fix to text/plain yourself).
