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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: How to restore visible region highlighting
Date: Tue, 06 Apr 2021 15:27:01 +0300
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In-Reply-To: <20210406100239.0b8a12ef@JRWUBU2> (message from Richard
 Wordingham on Tue, 6 Apr 2021 10:02:39 +0100)
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> Date: Tue, 6 Apr 2021 10:02:39 +0100
> From: Richard Wordingham <richard.wordingham@ntlworld.com>
> 
> I've just jumped from Emacs 24.4 and earlier on 32-bit Ubuntu 16.04.3
> to Debianised Emacs 26.3 on obligatorily 64-bit Ubuntu 20.04.2.
> 
> One of the things that broke is the highlighting of the 'region'.  My
> default background colour is white, and region used to be given a
> yellowish background.  It is now given a white background, as I have
> found by making my default background LightGray, so I do have a
> workaround.

That's not an upstream change, AFAIU, it's probably something your
distro does, or maybe (if this is a GTK build), the GTK theme has
changed.