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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: checking for light or dark background
Date: Sun, 20 Feb 2022 22:05:31 +0200
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In-Reply-To: <m3sfsdxrmk.fsf@carbon.jhcloos.org> (message from James Cloos on
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> From: James Cloos <cloos@jhcloos.com>
> Cc: help-gnu-emacs@gnu.org
> Copyright: Copyright 2022 James Cloos
> OpenPGP-Fingerprint: E9E9 F828 61A4 6EA9 0F2B  63E7 997A 9F17 ED7D AEA6
> Date: Sun, 20 Feb 2022 14:30:43 -0500
> 
> >>>>> "EZ" == Eli Zaretskii <eliz@gnu.org> writes:
> 
> EZ> You didn't tell what terminal you tried this on.  Some of them are
> EZ> capable of reporting their default background color, others aren't.
> 
> screen was running on rxvt-unicode.

So you are saying rxvt-set-background-mode doesn't work for you?