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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Adding fake cursors when resizing a window.
Date: Sun, 10 Mar 2019 20:27:10 +0200
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Cc: rudalics@gmx.at, emacs-devel@gnu.org
To: Keith David Bershatsky <esq@lawlist.com>
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In-reply-to: <m2a7i2wqr0.wl%esq@lawlist.com> (message from Keith David
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> Date:  Sun, 10 Mar 2019 11:04:03 -0700
> From:  Keith David Bershatsky <esq@lawlist.com>
> Cc:  emacs-devel@gnu.org,Martin Rudalics <rudalics@gmx.at>
> 
> -  Although the scroll bar in the center is no longer visible because it was overwritten during update_window, Emacs tries to remove the center scroll bar anyway and that is what erases the fake cursors along the vertical strip in the center of the screen.
> 
> -  At about the exact same time that the scroll bar in the center of the screen gets erased, the right scroll bar on the far right of the window is added.

Isn't this because the window-system removes the scroll bars?