t / t5100 / msg0018--no-inbody-headerson commit ref-filter: add an 'rstrip=<N>' option to atoms which deal with refnames (1a34728)
   1From: Another Thor
   2 <a.thor@example.com>
   3Subject: This one contains
   4        a tab
   5 and a space
   6
   7a commit message
   8