1 files changed, 8 insertions, 1 deletions
diff --git a/src/nvim/undo.c b/src/nvim/undo.c
index 35f46e512d..1eb73d85d7 100644
--- a/src/nvim/undo.c
+++ b/src/nvim/undo.c
@@ -120,6 +120,7 @@
 #include "nvim/path.h"
 #include "nvim/pos.h"
 #include "nvim/sha256.h"
+#include "nvim/spell.h"
 #include "nvim/state.h"
 #include "nvim/strings.h"
 #include "nvim/types.h"
@@ -2372,6 +2373,12 @@ static void u_undoredo(int undo, bool do_buf_event)
     }
 
     changed_lines(top + 1, 0, bot, newsize - oldsize, do_buf_event);
+    // When text has been changed, possibly the start of the next line
+    // may have SpellCap that should be removed or it needs to be
+    // displayed.  Schedule the next line for redrawing just in case.
+    if (spell_check_window(curwin) && bot <= curbuf->b_ml.ml_line_count) {
+      redrawWinline(curwin, bot);
+    }
 
     // Set the '[ mark.
     if (top + 1 < curbuf->b_op_start.lnum) {
@@ -2667,7 +2674,7 @@ void ex_undolist(exarg_T *eap)
       undo_fmt_time(IObuff + strlen(IObuff), IOSIZE - strlen(IObuff), uhp->uh_time);
       if (uhp->uh_save_nr > 0) {
         while (strlen(IObuff) < 33) {
-          STRCAT(IObuff, " ");
+          xstrlcat(IObuff, " ", IOSIZE);
         }
         vim_snprintf_add(IObuff, IOSIZE, "  %3ld", uhp->uh_save_nr);
       }