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From: Robert Pluim <rpluim@gmail.com>
Newsgroups: gnu.emacs.bug
Subject: bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1'
Date: Thu, 03 Sep 2020 17:10:30 +0200
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>>>>> On Thu, 03 Sep 2020 16:48:04 +0200, Andreas Schwab <schwab@linux-m68k=
.org> said:

    Andreas> On Sep 03 2020, Robert Pluim wrote:
    >> Does it go away if you set font-backend . ftcrhb in your frame
    >> parameters (assuming you=CA=BCre using Cairo)?

    Andreas> That completely removes the delay.

So the solution is easy: just deprecate and remove the 'x' backend :-)

Robert