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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: How to tell that buffer is not modifed?
Date: Thu, 25 Mar 2021 11:31:03 +0200
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In-Reply-To: <courier.00000000605C4F99.0000436F@stw1.rcdrun.com> (message from
 Jean Louis on Thu, 25 Mar 2021 11:53:36 +0300)
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> Date: Thu, 25 Mar 2021 11:53:36 +0300
> From: Jean Louis <bugs@gnu.support>
> 
> I would like to tell programmatically that buffer is not modified even
> though it is modified.

See the function set-buffer-modified-p.