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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Function to present few centered lines
Date: Wed, 14 Apr 2021 16:13:14 +0300
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> Date: Wed, 14 Apr 2021 16:03:45 +0300
> From: Jean Louis <bugs@gnu.support>
> 
> - enlarging font, I don't know how to enlarge it, so that width and
>   height of window is adjusted to new enlarged font

"Adjusted" in what way? to keep the same number of columns?  I think
you need to manually enlarge the window.

> - centering, I am trying to center line by using window-width and
>   setting fill-column, it seem it does not center nicely.

Why not use center-region?