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bug#39680: 27.0.60; electric-pair-mode broken by undo

From: Kévin Le Gouguec
Subject: bug#39680: 27.0.60; electric-pair-mode broken by undo
Date: Tue, 10 Mar 2020 07:45:38 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Stefan Monnier <address@hidden> writes:

>> Stefan, what is your view on this attempted patch?  Is it sound?
> I think we need something like the patch below (not really tested yet).

FWIW, I applied it and AFAICT I can't reproduce the issue.

>>> Thank you for your time.
>> Thank you for a good bug report, conveniently reduced to a minimum test
>> case.
> Indeed.  This is pretty delicate code, so a concise and easy to reproduce
> test case is very welcome.

Happy to help.  Though I wonder why my attempted ERT test only fails
half the time.  Reproduced here for context:

(ert-deftest electric-pair-undo-unrelated-state ()
    (let ((last-command-event ?\())
      (self-insert-command 1))
    (insert "hi there")
    (let ((last-command-event ?\())
      (self-insert-command 1))))

With your patch, C-x C-e'ing the inner with-temp-buffer form once
triggers no error (an "Undo" shows up in *Messages*); C-x C-e'ing a
second time without moving point causes a "No further undo information"
user error.

At any rate, thanks for the fix!

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