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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: highlight-indent-guides in display engine
Date: Thu, 11 Jul 2019 22:15:21 +0300
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Cc: emacs-devel@gnu.org
To: Ergus <spacibba@aol.com>
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> Date: Thu, 11 Jul 2019 21:06:51 +0200
> From: Ergus <spacibba@aol.com>
> Cc: emacs-devel@gnu.org
> 
> Check if indenting with spaces or tabs && add the indicator for
> those character (or every tab-width spaces) from the beginning of the line
> until the first different character of the line. And that's it...

I don't think I understand: what do you mean by "add the indicator"?
How would this indicator look like?