Richlv

Found

r1735680

r1735680 | danielsh | 2016-03-18 21:10:34 +0000 (Fri, 18 Mar 2016)

[ This revision should have been committed to trunk.  It was reverted on
  this branch, applied to trunk, and renominated in STATUS in r1735825,
  r1735826, and r1735827 respectively. ]

Make SIGINT abort a commit, even at the interactive plaintext prompt.
(Issue #4624.)

Follow-up to r30730 (r870804).

Found by: Richlv 

* subversion/libsvn_subr/prompt.c
  (plaintext_prompt_helper): Propagate canncellations.