Merge branch 'js/stash-p-fix'

Allowing the user to split a patch hunk while "git stash -p" does
not work well; a band-aid has been added to make this (partially)
work better.

* js/stash-p-fix:
  stash -p: (partially) fix bug concerning split hunks
  t3904: fix incorrect demonstration of a bug

diff --cc builtin/stash.c
Simple merge