- if (!DIFF_FILE_VALID(p->one)) {
- if (!DIFF_FILE_VALID(p->two))
- return 0; /* ignore unmerged */
+ struct userdiff_driver *textconv_one = get_textconv(p->one);
+ struct userdiff_driver *textconv_two = get_textconv(p->two);
+ mmfile_t mf1, mf2;
+ int ret;
+
+ if (!o->pickaxe[0])
+ return 0;
+
+ /*
+ * If we have an unmodified pair, we know that the count will be the
+ * same and don't even have to load the blobs. Unless textconv is in
+ * play, _and_ we are using two different textconv filters (e.g.,
+ * because a pair is an exact rename with different textconv attributes
+ * for each side, which might generate different content).
+ */
+ if (textconv_one == textconv_two && diff_unmodified_pair(p))
+ return 0;
+
+ fill_one(p->one, &mf1, &textconv_one);
+ fill_one(p->two, &mf2, &textconv_two);
+
+ if (!mf1.ptr) {
+ if (!mf2.ptr)
+ ret = 0; /* ignore unmerged */