Index: src/move.c
===================================================================
--- src/move.c	(revision 57762)
+++ src/move.c	(working copy)
@@ -2594,6 +2594,12 @@
 	return;
     }
 
+    if (Unix2003_compat) {
+	if (p_window_unix2003) {
+		*lp = loff1;	/* one line overlap only */
+		return;
+	}
+    }
     loff2 = *lp;
     if (dir > 0)
 	botline_forw(lp);