bug#41125: 28.0.50; Fwindow_text_pixel_size uses FETCH_CHAR (charpos)

[Eli Zaretskii]

> Cc: 41125@debbugs.gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Fri, 8 May 2020 09:18:27 +0200
> 
>  >> which cannot possibly be correct: FETCH_CHAR takes a byte position,
>  >> not a character position, but BEGV and ZV are measured in characters.
>  >
>  > Ouch!  Thanks.  Does the patch below look good?
> 
> It does.  Thanks for fixing yet another of my blunders in this function.
> And thanks to Pip for catching it.

Thanks, I pushed the fix to the emacs-27 branch.