Restore initial undo boundary with viper

* lisp/emulation/viper-cmd.el (viper-adjust-undo): Add back last undo
  boundary if it has been removed.

Addresses Bug#22295.

diff --git a/lisp/emulation/viper-cmd.el b/lisp/emulation/viper-cmd.el
index 93cf3b0fb10ac87d93e52ec58bd5469ce87b41b5..4bd819ab828f1e4408544c518a54bbd6ece7c9fc 100644 (file)
--- a/lisp/emulation/viper-cmd.el
+++ b/lisp/emulation/viper-cmd.el
@@ -1715,8 +1715,9 @@ invokes the command before that, etc."
       (let ((inhibit-quit t)
            tmp tmp2)
        (setq viper-undo-needs-adjustment nil)
-       (if (listp buffer-undo-list)
-           (if (setq tmp (memq viper-buffer-undo-list-mark buffer-undo-list))
+       (when (listp buffer-undo-list)
+          (let ((had-boundary (null (car buffer-undo-list))))
+            (if (setq tmp (memq viper-buffer-undo-list-mark buffer-undo-list))
                (progn
                  (setq tmp2 (cdr tmp)) ; the part after mark
 
@@ -1729,8 +1730,11 @@ invokes the command before that, etc."
                        (delq viper-buffer-undo-list-mark buffer-undo-list))
                  ;; restore tail of buffer-undo-list
                  (setq buffer-undo-list (nconc buffer-undo-list tmp2)))
-             (setq buffer-undo-list (delq nil buffer-undo-list)))))
-    ))
+             (setq buffer-undo-list (delq nil buffer-undo-list)))
+            ;; The top-level loop only adds boundaries if there has been
+            ;; modifications in the buffer, so make sure we don't accidentally
+            ;; drop the "final" boundary (bug#22295).
+           (if had-boundary (undo-boundary)))))))
 
 
 (defun viper-set-complex-command-for-undo ()