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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Q: child frames on ttys
Date: Mon, 02 Sep 2024 14:38:50 +0300
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To: Gerd =?utf-8?Q?M=C3=B6llmann?= <gerd.moellmann@gmail.com>
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In-Reply-To: <m24j6ya1ta.fsf@pro2.fritz.box> (message from Gerd
 =?utf-8?Q?M=C3=B6llmann?= on Mon, 02 Sep 2024 10:37:37 +0200)
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> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: rudalics@gmx.at,  emacs-devel@gnu.org
> Date: Mon, 02 Sep 2024 10:37:37 +0200
> 
> Just wanted to mention that I had an idea yesterday how to solve that
> problem without making broad changes outside of the tty code. The idea
> is to write a function that maps an (x, y) position in a
> matrix the frame holding the realized face at that position.

Sorry, I don't understand: a function mapping a position to what?
'struct face'?  If so, and unless the function is cheap enough,
wouldn't that make redisplay slower?