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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Identifying the face between STRETCH and right fringe.
Date: Wed, 28 Nov 2018 18:20:22 +0200
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In-reply-to: <m2r2f5ban1.fsf@gmail.com> (message from Robert Pluim on Wed, 28
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> From: Robert Pluim <rpluim@gmail.com>
> Cc: emacs-devel@gnu.org
> Date: Wed, 28 Nov 2018 14:21:38 +0100
> 
> > Why they don't do the same with face colors as they do with
> > FRAME_BACKGROUND_PIXEL, i.e. convert to RGBA and store the RGBA in the
> > face colors, instead of the indices.
> 
> Because then every time they want to do something with a face colour,
> they'd have to convert it from RGBA, allocate the corresponding
> NSColor, use it, destroy it etc.

But that's how every other platform does that, AFAIU...