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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Unify the Platforms: Cairo+FreeType+Harfbuzz Everywhere (except
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Date: Sun, 17 May 2020 20:06:25 +0300
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To: Arthur Miller <arthur.miller@live.com>
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 (message from Arthur Miller on Sun, 17 May 2020 18:50:04 +0200)
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> From: Arthur Miller <arthur.miller@live.com>
> Cc: emacs-devel@gnu.org,  julius.pfrommer@web.de
> Date: Sun, 17 May 2020 18:50:04 +0200
> 
> Are there any guidelines if one would like to restructure something?

The guideline is to factor any GUI code into common part and
platform-specific part, and define interfaces for the latter whose
implementation is in the corresponding *term.[cm] or *fns.[cm].