When reading an email thread with Emacs client of notmuch, there are two
places where the email subject is displayed -- one at the top of the
buffer, and per each email in the thread.

When the subject contains '%' in it, the global subject line at the top
of the buffer doesn't show it and the subject looks weird.  Say I have
an email with subject "100% increase in latency", the top line will say
"100increase in latency".  Note that the space after the '%' symbol is
also removed.  The subject line per email shows it fine.

Can this be fixed?  I'm very annoyed by this :)

Thanks,
-jinwoo