someone on the #svn IRC channel, some time ago

Found

r1026105

r1026105 | stsp | 2010-10-21 19:07:54 +0000 (Thu, 21 Oct 2010)

[ Note from the future: This commit was reverted in r1026270 because
                        it made the buildbots fail ]

* subversion/libsvn_wc/merge.c
  (merge_text_file): Don't leak temporary file RESULT_TARGET.
   E.g. when a text conflict happened during an update, and the user
   chose 'theirs-full', a file containing the diff3 merge result with
   conflict markers was left over in .svn/tmp/ directory.

Found by: someone on the #svn IRC channel, some time ago