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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Enclosing text in a box
Date: Wed, 16 Nov 2022 15:58:14 +0200
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 (message from Alexis Roda on Wed, 16 Nov 2022 14:34:09 +0100)
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> From: Alexis Roda <alexis.roda.villalonga@gmail.com>
> Date: Wed, 16 Nov 2022 14:34:09 +0100
> Cc: Heime via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
> 
> You were almost there, (make-string (length text") ?=)

Using 'length' to measure the width of text on display is not
reliable, because there are characters of different width.  It is
better to use 'string-width' or 'string-pixel-width' instead.