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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Using defcustom to set width and height for set-window-scroll-bars
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 (message from Heime on Tue, 14 May 2024 13:54:59 +0000)
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> Date: Tue, 14 May 2024 13:54:59 +0000
> From: Heime <heimeborgia@protonmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>, help-gnu-emacs@gnu.org
> 
> Have applied a change for width and height to 55 to get the following information.
> There is no way that colums and lines are correct.
> 
> (55 5 right 55 3 bottom nil)

Why not?  Looks entirely reasonable to me, at least up front and
without knowing the exact metrics of your default-font.

What do default-font-height and default-font-width return in your
case?