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The previous commit taught xdiff to optionally provide the hunk header data to a specialized callback. But most users of xdiff actually use our more convenient xdi_diff_outf() helper, which ensures that our callbacks are always fed whole lines. Let's plumb the special hunk-callback through this interface, too. It will follow the same rule as xdiff when the hunk callback is NULL (i.e., continue to pass a stringified hunk header to the line callback). Since we add NULL to each caller, there should be no behavior change yet. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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