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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Question about display engine
Date: Mon, 26 Aug 2019 10:45:11 +0300
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To: Ergus <spacibba@aol.com>
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In-reply-to: <20190826043145.pm5aplrxna5hwcso@Ergus> (message from Ergus on
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> Date: Mon, 26 Aug 2019 06:31:45 +0200
> From: Ergus <spacibba@aol.com>
> Cc: rudalics@gmx.at, emacs-devel@gnu.org
> 
> On Sun, Aug 25, 2019 at 01:44:04PM +0300, Eli Zaretskii wrote:
> 
> >
> >Feel free to ask questions.  (I don't think anything in the summary
> >was related to Lisp, but maybe I'm wrong.)
> >
> 
> Hi:
> 
> Could you please finally explain what are all the points needed in the
> implementation? And more or less the changes needed/expected?

Regarding face extension, or regarding highlight-indentation?  These
were 2 separate discussions, but you somehow conflated them together
in your last email.