Function diff_might_be_rename

tree-diff.c:594–598

* Does it look like the resulting diff might be due to a rename? * - single entry * - not a valid previous file */

 *  - not a valid previous file
 */
static inline int diff_might_be_rename(void)
{
	return diff_queued_diff.nr == 1 &&
		!DIFF_FILE_VALID(diff_queued_diff.queue[0]->one);
}

static void try_to_follow_renames(const struct object_id *old_oid,
				  const struct object_id *new_oid,