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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Cursor drawing
Date: Fri, 21 Dec 2018 22:41:56 +0200
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> Date: Fri, 21 Dec 2018 22:37:31 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> Use GUI primitives there to draw lines and other figures, as the
> case may be.

And probably also remove those at the beginning of each redisplay
cycle, to avoid leaving artifacts on screen when/if redisplay decides
to scroll.