--- rxvt-unicode/src/screen.C	2013/01/13 20:11:21	1.429
+++ rxvt-unicode/src/screen.C	2013/01/13 20:16:40	1.430
@@ -285,7 +285,8 @@
 
           memcpy (swap_buf  [row].t, prev_swap_buf  [row].t, sizeof (text_t) * common_col);
           memcpy (swap_buf  [row].r, prev_swap_buf  [row].r, sizeof (rend_t) * common_col);
-          swap_buf [row].l = prev_swap_buf [row].l;
+          swap_buf [row].l = min (prev_swap_buf [row].l, ncol);
+          swap_buf [row].f = prev_swap_buf [row].f;
         }
 
       int p    = MOD (term_start + prev_nrow, prev_total_rows);  // previous row