updated for version 7.4.388
Problem:    With 'linebreak' set and 'list' unset a Tab is not counted
            properly. (Kent Sibilev)
Solution:   Check the 'list' option. (Christian Brabandt)
diff --git a/src/screen.c b/src/screen.c
index abbd911..188b36f 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -4494,7 +4494,7 @@
 		    tab_len = (int)wp->w_buffer->b_p_ts
 					- vcol % (int)wp->w_buffer->b_p_ts - 1;
 #ifdef FEAT_LINEBREAK
-		    if (!wp->w_p_lbr)
+		    if (!wp->w_p_lbr || !wp->w_p_list)
 #endif
 		    /* tab amount depends on current column */
 			n_extra = tab_len;