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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: bug#44020: 28.0.50; Prefer selection of colour emoji fonts?
Date: Tue, 20 Oct 2020 17:28:14 +0300
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Cc: 44020@debbugs.gnu.org, larsi@gnus.org, stephen.berman@gmx.net
To: Robert Pluim <rpluim@gmail.com>
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In-Reply-To: <m2k0vlclzc.fsf@gmail.com> (message from Robert Pluim on Tue, 20
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> From: Robert Pluim <rpluim@gmail.com>
> Cc: 44020@debbugs.gnu.org,  larsi@gnus.org,  Stephen Berman
>  <stephen.berman@gmx.net>
> Date: Tue, 20 Oct 2020 10:58:31 +0200
> 
> So it was failing on Debian as well, until I deleted my
> ~/.config/fontconfig directory, which ended up fixing it on Ubuntu as
> well.

This Fontconfig cache thingy appears in too many trouble reports.
Sounds like something we should ask users to do up front whenever they
report some weird font-related issue.