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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Add a function that returns pixel distance between points?
Date: Tue, 02 Feb 2021 18:29:15 +0200
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Cc: emacs-devel@gnu.org
To: Yuan Fu <casouri@gmail.com>
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 Yuan Fu on Mon, 1 Feb 2021 18:00:18 -0500)
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> From: Yuan Fu <casouri@gmail.com>
> Date: Mon, 1 Feb 2021 18:00:18 -0500
> Cc: emacs-devel <emacs-devel@gnu.org>
> 
> This code inserts a mini table
> 
> | looooong |
> | world |
> 
> And tries to aligns it to
> 
> | looooong |
> | world    |
> 
> You will notice there are extra white space on the right of the cells, and the table actually looks like this:
> 
> | loooooong    |
> | world        |
> 
> That’s because window-text-pixel-size returned a width that’s larger than the true with of the cells. If you enlarge the line-prefix, the extra space grows.

Hmm... this sounds like some bug in window-text-pixel-size.  Let me
take a closer look.