bug#64989: 29.1; Comment or uncomment lines in elisp-mode will show message in minibuffer

[Eli Zaretskii]

Ping! Ping!

> Cc: aqua0210@foxmail.com, 64989@debbugs.gnu.org
> Date: Sat, 12 Aug 2023 09:43:54 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> Ping!  Stefan, any suggestions?
> 
> > Cc: 64989@debbugs.gnu.org
> > Date: Tue, 01 Aug 2023 16:20:20 +0300
> > From: Eli Zaretskii <eliz@gnu.org>
> > 
> > > From: Eason Huang <aqua0210@foxmail.com>
> > > Date: Tue, 01 Aug 2023 19:13:59 +0800
> > > 
> > > Hello Emacs,
> > > 
> > > When update to the new released Emacs 29.1, I found that when comment or
> > > uncomment lines in emacs-lisp-mode will show message in minibuffer as
> > > below:
> > > ```
> > > combine-change-calls: buffer-undo-list broken
> > > ```
> > > Steps to reproduce:
> > > 1. create a test.el file with any Elisp code. such as:
> > > ```
> > > (message "Test")
> > > ```
> > > 2. start emacs and open the test.el file with `emacs -Q ~/test.el`
> > > 3. Use C-x C-; (comment-line) to comment the code in test.el
> > > 4. Now you will see the message mentioned above.
> > 
> > Thanks.
> > 
> > Stefan, I think this is due to the commit below:
> > 
> > | Author:     Stefan Monnier <monnier@iro.umontreal.ca>
> > | AuthorDate: Fri Jan 13 17:38:04 2023 -0500
> > | Commit:     Stefan Monnier <monnier@iro.umontreal.ca>
> > | CommitDate: Fri Jan 13 17:38:04 2023 -0500
> > |
> > |     * lisp/subr.el (combine-change-calls-1): Fix bug#60467
> > |
> > |     Don't stop at timestamps.  Strip them for now, to be on the safe side.
> > |     Don't merge into `master` where we'll use a better fix.
> > 
> > My "partial bisecting" indicates that the bug was introduced between
> > Dec 31, 2022 and Jan 31, 2023, and the above is the only commit
> > in-between that could matter.
> > 
> > If indeed this is the culprit, can we perhaps backport the "better
> > fix" from master to the emacs-29 branch?
> 
> 
> 
>