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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Cursor drawing
Date: Sat, 22 Dec 2018 19:03:54 +0200
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Sat, 22 Dec 2018 11:43:31 -0500
> 
> Another way to look at it is that scrolling the display's pixels can
> only be used when both layers (the glyph-matrix and the overlay) were
> moved together.

Alternatively, you could define the scroll region to include both.