[PATCH 0/6 RFC] Series to correct xutils incomplete line handling.

[1/6]
Add supplemental test for trailing-whitespace on incomplete lines.

-- This patch is for illustrative purposes only. It exposes the current 
failures of git diff whitespace ignore options when dealing with trailing-
spaces on incomplete lines.

[2/6] through [5/6]
Make xdl_hash_record_with_whitespace ignore eof
Make diff -w handle trailing-spaces on incomplete lines.
Make diff -b handle trailing-spaces on incomplete lines.
Make diff --ignore-space-at-eol handle incomplete lines.

-- These alter the record ptr loops to go to the end of the record and to 
treat the terminator as it would '\n'.

[6/6]
Add diff tests for trailing-space on incomplete lines

-- Just the seven test cases that would identify future breakage.


 t/t4015-diff-trailing-whitespace.sh |   95 +++++++++++++++++++++++++++++++++++
 t/t4015-diff-whitespace.sh          |   33 ++++++++++++
 xdiff/xutils.c                      |   20 ++++----
 3 files changed, 138 insertions(+), 10 deletions(-)
 create mode 100755 t/t4015-diff-trailing-whitespace.sh