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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Q: Invisible text spec + define minor mode macro
Date: Wed, 21 Apr 2021 12:16:36 +0300
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To: Arthur Miller <arthur.miller@live.com>
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 (message from Arthur Miller on Wed, 21 Apr 2021 10:04:17 +0200)
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> From: Arthur Miller <arthur.miller@live.com>
> Date: Wed, 21 Apr 2021 10:04:17 +0200
> 
> I am not sure what is going on here. I have this minor mode defined,
> as shown yesterday, where I just iterate through a buffer and try to
> make certain lines invisible.
> 
> It seems that visibility property updates only for about 2 ~ 3 pages of
> text. When I bring text into visible portion of screen and re-run the
> mode, it is updated as it should. Does it have to do something with how
> invisible text is rendered?

In general, text being invisible or not has nothing to do with
rendering it, it only has to do with the exact form of the invisible
property and buffer's invisibility spec.