(momentary-string-display): Avoid modifying the undo list.

1 files changed, 2 insertions, 0 deletions

diff --git a/lisp/subr.el b/lisp/subr.el
index 5a08278241f..50321c3d666 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -600,6 +600,8 @@ Display MESSAGE (optional fourth arg) in the echo area.
 If MESSAGE is nil, instructions to type EXIT-CHAR are displayed there."
   (or exit-char (setq exit-char ?\ ))
   (let ((buffer-read-only nil)
+        ;; Don't modify the undo list at all.
+        (buffer-undo-list t)
         (modified (buffer-modified-p))
         (name buffer-file-name)
         insert-end)