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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Fill column indicator functionality
Date: Sat, 16 Mar 2019 09:48:32 +0200
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Cc: ofv@wanadoo.es, emacs-devel@gnu.org
To: Ergus <spacibba@aol.com>
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> Date: Sat, 16 Mar 2019 00:22:50 +0100
> From: Ergus <spacibba@aol.com>
> Cc: emacs-devel@gnu.org
> 
> I am not sure that my work is related with toolbars issues.

In some configuration, where Emacs itself draws the tool bar (as
opposed to the toolkit doing that), the tool bar is a special kind of
window, and redisplay handles that window as well.  Your code should
refrain from producing the indicator in such windows.  I wrote in my
previous message how I propose to do that.