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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Ligatures (was: Unify the Platforms: Cairo+FreeType+Harfbuzz
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Date: Fri, 22 May 2020 22:01:51 +0300
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> Cc: pipcet@gmail.com, alan@idiocy.org, emacs-devel@gnu.org
> From: Clément Pit-Claudel <cpitclaudel@gmail.com>
> Date: Fri, 22 May 2020 10:34:06 -0400
> 
> > I was talking about ligatures made from letters, not symbols.
> 
> But then how do you handle symbol ligatures?

By using suitable regular expressions.  E.g., you could take the list
of ligatures in that FiraCode site and convert them into a regexp or a
set of regexps.