updated for version 7.4.288
Problem:    When 'spellfile' is set the screen is not redrawn.
Solution:   Redraw when updating the spelling info. (Christian Brabandt)
diff --git a/src/spell.c b/src/spell.c
index 768c7c5..5063642 100644
--- a/src/spell.c
+++ b/src/spell.c
@@ -4508,6 +4508,7 @@
 theend:
     vim_free(spl_copy);
     recursive = FALSE;
+    redraw_win_later(wp, NOT_VALID);
     return ret_msg;
 }