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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Fill column indicator functionality
Date: Wed, 13 Mar 2019 22:09:42 +0200
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To: Ergus <spacibba@aol.com>
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> Date: Wed, 13 Mar 2019 21:02:25 +0100
> From: Ergus <spacibba@aol.com>
> Cc: emacs-devel@gnu.org
> 
> >  Lisp_Object save_object = it->object;
> >  it->object = Qnil;
> >
> >before the call to PRODUCE_GLYPHS, and then restore it->object to its
> >previous value after PRODUCE_GLYPHS.
> >
> I thought that append_stretch_glyph was putting the it->object to Now I
> see it didn't.

append_stretch_glyph only does that for the stretch glyph it creates,
it doesn't change it->object.

> 1E6 Thanks.

My pleasure.