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

[Gregory Heytings]

> > (advice-add 'fit-window-to-buffer :after
> >             (lambda () (and (= (count-lines (point-min) (point-max)) (1- 
> > (window-height)))
> >                             (or (< (point) (point-max)) (forward-line -1) t)
> >                             (set-window-start nil (point-min)))))
>
> Why shouldn't this be the default behavior?

I think because fit-window-to-buffer isn't supposed to move point, and 
point would become invisible if it is not moved.  The docstring says: 
"Note that even if this function makes WINDOW large enough to show _all_ 
parts of its buffer you might not see the first part when WINDOW was 
scrolled."