Re: [PATCH 2/2] format-patch: don't include --stat with --range-diff output

Ævar Arnfjörð Bjarmason  [off-list ref] writes:

 	if (rev->rdiff1) {
+		struct diff_options opts;
+		memcpy(&opts, &rev->diffopt, sizeof(opts));
+		opts.output_format &= ~(DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY);
+
 		fprintf_ln(rev->diffopt.file, "%s", rev->rdiff_title);
 		show_range_diff(rev->rdiff1, rev->rdiff2,
-				rev->creation_factor, 1, &rev->diffopt);
+				rev->creation_factor, 1, &opts);

I am not quite convinced if this shallow copy is a safe thing to do.
Quite honestly at this late in the release cycle, as a band-aid, I'd
rather see a simpler revert than a change like this that we have to
worry about what happens if/when show_range_diff() _thinks_ it is
done with the opts and ends up discarding resources (e.g. "FILE *")
that are shared with rev->diffopt that would still have to be used
later.