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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Display certain glyphs with paddings on the side
Date: Tue, 03 Dec 2019 19:38:42 +0200
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To: =?utf-8?Q?Cl=C3=A9ment?= Pit-Claudel <cpitclaudel@gmail.com>
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> From: Clément Pit-Claudel <cpitclaudel@gmail.com>
> Date: Tue, 3 Dec 2019 11:42:03 -0500
> 
> I think Emacs might have most of the features needed already as part of the composition engine

No, character composition does nothing to the width of glyphs on
display.  We take the width from the glyph metrics reported by the
font.