bug#57837: 29.0.50; fit-window-to-buffer should reposition the buffer

[Eli Zaretskii]

> From: Sam Steingold <sds@gnu.org>
> Date: Thu, 15 Sep 2022 14:55:16 -0400
> Cc: 57837@debbugs.gnu.org
> 
> > >> --8<---------------cut here---------------start------------->8---
> > >> (and (pos-visible-in-window-p (point-min))
> > >>      (pos-visible-in-window-p (point-max)))
> > >> --8<---------------cut here---------------end--------------->8---
> 
> replacing `poing-min` and `point-max` with beginning-of-text and
> end-of-text, of course...

What are beginning-of-text and end-of-text?  I don't find such
functions in Emacs.