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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: master 7362554: Widen around c-font-lock-fontify-region. This
 fixes bug #38049.
Date: Thu, 14 Nov 2019 16:29:26 +0200
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To: Dmitry Gutov <dgutov@yandex.ru>
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> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Thu, 14 Nov 2019 16:05:13 +0200
> Cc: Alan Mackenzie <acm@muc.de>, emacs-devel@gnu.org
> 
> The hope is that calling vertical-motion (or font-lock-ensure directly) 
> inside narrowing is a rare occasion

Why do we need to have such hopes?  The reality could be different,
and I'd like us to support those different conditions.  It doesn't
sound like it's much harder.