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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: buffer-modified-tick and text properties
Date: Sat, 20 Apr 2024 19:10:36 +0300
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> From: JD Smith <jdtsmith@gmail.com>
> Date: Sat, 20 Apr 2024 11:11:10 -0400
> Cc: emacs-devel <emacs-devel@gnu.org>
> 
> > If you want to know only about changes to characters, perhaps
> > buffer-chars-modified-tick is a better function to use?
> 
> Missed this function; it should work perfectly, thanks. I wonder, aside from text properties, are there any other changes within the buffer that cause buffer-modified-tick but not buffer-chars-modified-tick to be incremented?

There's restore-buffer-modified-p and
internal--set-buffer-modified-tick, but that's all, AFAICT.