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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Allowing point to be outside the window?
Date: Sat, 04 Dec 2021 18:33:28 +0200
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To: dick <dick.r.chiang@gmail.com>
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In-Reply-To: <87fsr8jvy2.fsf@dick> (message from dick on Sat, 04 Dec 2021
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> From: dick <dick.r.chiang@gmail.com>
> Date: Sat, 04 Dec 2021 09:17:41 -0500
> Cc: emacs-devel@gnu.org
> 
> When you bypass large state-heavy stanzas via "if allow-point-outside"
> in central functions like try_cursor_movement() and redisplay_window(),
> people (not you or EZ apparently) get scared.

Only people who have no clear idea about the overall structure of
redisplay_window can become nervous when they see such bypasses, as a
matter of principle, without considering what exactly is bypassed and
why.  A place to begin is by figuring out what does that "try" in
"try_cursor_movement" means.