[Emacs-diffs] master c98bc98: Ensure undo-boundary after all commands

[Phillip Lord]

branch: master
commit c98bc9821f4a402d5fda67fe141ed34622c50e4f
Author: Phillip Lord <address@hidden>
Commit: Phillip Lord <address@hidden>

    Ensure undo-boundary after all commands
    
    * lisp/simple.el (undo-auto--boundaries): Ensure an undo-boundary after
      every command whether it (apparently) changes the buffer or not.
    
    See Bug#23785 for discussion.
---
 lisp/simple.el |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lisp/simple.el b/lisp/simple.el
index a502448..bc3e7b8 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -2884,6 +2884,10 @@ REASON describes the reason that the boundary is being 
added; see
   "Check recently changed buffers and add a boundary if necessary.
 REASON describes the reason that the boundary is being added; see
 `undo-last-boundary' for more information."
+  ;; (Bug #23785) All commands should ensure that there is an undo
+  ;; boundary whether they have changed the current buffer or not.
+  (when (eq cause 'command)
+    (add-to-list 'undo-auto--undoably-changed-buffers (current-buffer)))
   (dolist (b undo-auto--undoably-changed-buffers)
           (when (buffer-live-p b)
             (with-current-buffer b