xdiff: PATIENCE/HISTOGRAM are not independent option bits

diff --git a/diff.h b/diff.h
index 0c51724493f76461b67d6ef8f5556852819ad809..e688a48d10de628415129c334e96361be973abcd 100644 (file)
--- a/diff.h
+++ b/diff.h
@@ -88,6 +88,8 @@ typedef struct strbuf *(*diff_prefix_fn_t)(struct diff_options *opt, void *data)
 #define DIFF_XDL_SET(opts, flag)    ((opts)->xdl_opts |= XDF_##flag)
 #define DIFF_XDL_CLR(opts, flag)    ((opts)->xdl_opts &= ~XDF_##flag)
 
+#define DIFF_WITH_ALG(opts, flag)   (((opts)->xdl_opts & ~XDF_DIFF_ALGORITHM_MASK) | XDF_##flag)
+
 enum diff_words_type {
        DIFF_WORDS_NONE = 0,
        DIFF_WORDS_PORCELAIN,