updated for version 7.3.1203

Problem:    Matches from matchadd() might be highlighted incorrectly when they
            are at a fixed position and inserting lines. (John Szakmeister)
Solution:   Redraw all lines below a change if there are highlighted matches.
            (idea by Christian Brabandt)

src/screen.c

@@ -1637,6 +1637,10 @@ win_update(wp)
 						      && hasAnyFolding(wp)) ||
 # endif
 					syntax_check_changed(lnum)))
+#endif
+#ifdef FEAT_SEARCH_EXTRA
+				/* match in fixed position might need redraw */
+				||  wp->w_match_head != NULL
 #endif
 				)))))
 	{