whitespaces is reported with zero exit status when run with
--exit-code, and there is no "diff --git" header for such a change.
+ * external diff and textconv helpers are now executed using the shell.
+ This makes them consistent with other programs executed by git, and
+ allows you to pass command-line parameters to the helpers. Any helper
+ paths containing spaces or other metacharacters now need to be
+ shell-quoted. The affected helpers are GIT_EXTERNAL_DIFF in the
+ environment, and diff.*.command and diff.*.textconv in the config
+ file.
Updates since v1.6.6
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