Merge branch 'cb/diff-fname-optim' into maint

* cb/diff-fname-optim:
  diff: avoid repeated scanning while looking for funcname
  do not search functions for patch ID
  add rebase patch id tests

diff.c

@@ -3870,7 +3870,7 @@ static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
 
 		xpp.flags = 0;
 		xecfg.ctxlen = 3;
-		xecfg.flags = XDL_EMIT_FUNCNAMES;
+		xecfg.flags = 0;
 		xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
 			      &xpp, &xecfg);
 	}