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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 11:43:46 +0000)
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> Date: Tue, 14 May 2024 11:43:46 +0000
> From: Heime <heimeborgia@protonmail.com>
> Cc: help-gnu-emacs@gnu.org
> 
> > > Is defcustom with ":type 'integer", the right thing to do in order to allow
> > > users to customise width and height ?
> > 
> > 
> > If you want them to be able to specify values that are not numbers,
> > then no.
> 
> As described in the docs, I am taking that the value provided to the
> defcustom variable correspond to dimensions in pixels.

That's not all the doc string says about the possible values of width
and height.