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Re: Cursor drawing

From: Stefan Monnier
Subject: Re: Cursor drawing
Date: Sat, 22 Dec 2018 11:43:31 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

> This kind of drawing cannot be part of the display engine, since you
> want to draw over the text, and thus redisplay will overwrite portions
> of your arrows.

That's why I was suggesting a separate layer.

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

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.


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