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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: disable region after running a command on it
Date: Tue, 13 Dec 2022 15:13:53 +0200
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 (message from Luca Ferrari on Tue, 13 Dec 2022 12:18:40 +0100)
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> From: Luca Ferrari <fluca1978@gmail.com>
> Date: Tue, 13 Dec 2022 12:18:40 +0100
> 
> is there a way to disable a region every time a command has been run
> on it? For example, I mark a region, M-x eval-region and I would like
> that the region selection disappear.

Add deactivate-mark to your post-command-hook?