diff: tweak a _copy_ of diff_options with word-diff

When using word diff, the code sets the word_regex from various
defaults if it was not set already.  The problem is that it does this
on the original diff_options, which will also be used in subsequent
diffs.

This means that when the word_regex is not given on the command line,
only the first diff for which a setting for word_regex (either from
attributes or diff.wordRegex) ever takes effect.  This value then
propagates to the rest of the diff runs and in particular prevents
further attribute lookups.

Fix the problem of changing diff state once and for all, by working
with a _copy_ of the diff_options.

Noticed-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff.c

@@ -1008,11 +1008,13 @@ static const char *userdiff_word_regex(struct diff_filespec *one)
 }
 
 static void init_diff_words_data(struct emit_callback *ecbdata,
-				 struct diff_options *o,
+				 struct diff_options *orig_opts,
 				 struct diff_filespec *one,
 				 struct diff_filespec *two)
 {
 	int i;
+	struct diff_options *o = xmalloc(sizeof(struct diff_options));
+	memcpy(o, orig_opts, sizeof(struct diff_options));
 
 	ecbdata->diff_words =
 		xcalloc(1, sizeof(struct diff_words_data));
@@ -1052,6 +1054,7 @@ static void free_diff_words_data(struct emit_callback *ecbdata)
 {
 	if (ecbdata->diff_words) {
 		diff_words_flush(ecbdata);
+		free (ecbdata->diff_words->opt);
 		free (ecbdata->diff_words->minus.text.ptr);
 		free (ecbdata->diff_words->minus.orig);
 		free (ecbdata->diff_words->plus.text.ptr);

t/t4034-diff-words.sh

@@ -365,7 +365,7 @@ test_expect_success 'setup history with two files' '
 	git commit -mmodified -a
 '
 
-test_expect_failure 'wordRegex for the first file does not apply to the second' '
+test_expect_success 'wordRegex for the first file does not apply to the second' '
 	echo "*.tex diff=tex" >.gitattributes &&
 	git config diff.tex.wordRegex "[a-z]+|." &&
 	cat >expect <<-\EOF &&