commit 67157248154a23138c2b7ff2eebecbdf3d079ef7
from: Neels Hofmeyr <neels@hofmeyr.de>
date: Fri Nov 06 02:12:56 2020 UTC

fix patience: off-by-one preventing swallow the same identical line twice

commit - ede78929bedd695e06a0c30839b9a561b5d6bc9c
commit + 67157248154a23138c2b7ff2eebecbdf3d079ef7
blob - a845cbd14cd84545c0356b938d9ecc930f7f9890
blob + 71371779dde10d2eea855d4434f62c2b74b4e87b
--- lib/diff_patience.c
+++ lib/diff_patience.c
@@ -389,7 +389,7 @@ diff_atoms_swallow_identical_neighbors(struct diff_dat
 		 * common-unique line in a previous iteration.
 		 */
 		for (identical_l.start = l_idx, identical_r.start = r_idx;
-		     identical_l.start > l_min && identical_r.start > 0;
+		     identical_l.start > (l_min+1) && identical_r.start > 0;
 		     identical_l.start--, identical_r.start--) {
 			bool same;
 			int rc = diff_atom_same(&same,