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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: How to remove the "read-only" property...
Date: Sun, 28 Aug 2022 11:16:54 +0300
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To: Davin Pearson <davin.pearson@gmail.com>
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 (message from Davin Pearson on Sun, 28 Aug 2022 19:27:07 +1200)
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> From: Davin Pearson <davin.pearson@gmail.com>
> Date: Sun, 28 Aug 2022 19:27:07 +1200
> 
> When I try to remove all text-properties:
> 
> (condition-case err
>     (save-excursion
>       (set-text-properties (point-min) (point-max) nil))
>   (error
>    (message "dmp-error:err=%s" err)))
> 
> It barfs with the following error message:
> 
> dmp-error:err=(text-read-only)
> 
> How do I go about removing the read-only property of the text?

Bind inhibit-read-only to a non-nil value.