if (!S_ISREG(src->mode) || !S_ISREG(dst->mode))
return 0; /* leave symlink rename alone */
+ if (src->sha1_valid && dst->sha1_valid &&
+ !memcmp(src->sha1, dst->sha1, 20))
+ return 0; /* they are the same */
+
if (diff_populate_filespec(src, 0) || diff_populate_filespec(dst, 0))
return 0; /* error but caught downstream */