[emacs-w3m:13869] Emacs-w3m/Emacs (?) bug with saved buffer and undo?

Emanuel Berg <[email protected]> Sat, 28 May 2022 05:00:37 +0200
Newsgroups gmane.emacs.w3m
Message-ID <[email protected]>
Navigate to a page, e.g. https://dataswamp.org/~rjc/motd.txt

Save as motd.txt in ${HOME}.

Type something.

Do M-x undo RET

It says "undo-start: No undo information in this buffer"

Versions:

GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, cairo version 1.16.0)
 of 2022-05-22 [714970f5967f2153bb95e35823dbd917e0e5b60b]

Emacs-w3m 1.4.632

w3m/0.5.3+git20210102

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