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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: bug#16475: enhancement request: remove vertical scroll bar
	automatically when not needed
Date: Thu, 26 Oct 2017 20:07:39 +0300
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In-reply-to: <m24lql99s1.wl%esq@lawlist.com> (message from Keith David
	Bershatsky on Thu, 26 Oct 2017 09:03:10 -0700)
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> Date:  Thu, 26 Oct 2017 09:03:10 -0700
> From:  Keith David Bershatsky <esq@lawlist.com>
> Cc:  16475@debbugs.gnu.org,Martin Rudalics <rudalics@gmx.at>
> 
> The values for window-start and window-end will not necessarily be accurate until somewhere towards the end of redisplay.  A test that relies upon those values to add/remove scroll bars will often fail.

We have the ability to check whether the entire buffer fits in the
window without actually displaying it.  The move_it_to function can be
used for that.