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

[Sam Steingold <sds@gnu.org>]

Hi,

When the buffer is smaller than the window, move the point to the end
and do `C-x w -` (fit-window-to-buffer).
The window shrinks, but it is empty - the whole buffer is above.
One has to move the point to the beginning-of-buffer to make the buffer
visible.

I think this is a bug - the window should show the whole buffer; after
all this is the raison d'etre of `fit-window-to-buffer', right?

Basically, after `fit-window-to-buffer' is called, the following should
evaluate to t:

--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---

Thank you.


In GNU Emacs 29.0.50 (build 1, x86_64-apple-darwin21.6.0, NS
 appkit-2113.60 Version 12.5.1 (Build 21G83)) of 2022-09-13 built on
 3c22fb11fdab.ant.amazon.com
Repository revision: 7df898d532f922ea2a7acce4446bc35eec1da38e
Repository branch: master
Windowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.5.1

Configured using:
 'configure 'LDFLAGS=-fsanitize=address -fno-omit-frame-pointer'
 'CFLAGS=-g -O0 -fsanitize=address -fno-omit-frame-pointer''

Configured features:
ACL GIF GMP GNUTLS JPEG JSON LCMS2 LIBXML2 MODULES NOTIFY KQUEUE NS
PDUMPER PNG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP ZLIB

Important settings:
  value of $LANG: C
  locale-coding-system: utf-8-unix

Major mode: Help

Minor modes in effect:
  outline-minor-mode: t
  pyvenv-mode: t
  shell-dirtrack-mode: t
  global-edit-server-edit-mode: t
  winner-mode: t
  which-function-mode: t
  url-handler-mode: t
  desktop-save-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  isearch-fold-quotes-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  buffer-read-only: t
  column-number-mode: t
  line-number-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t


-- 
Sam Steingold (https://aphar.dreamwidth.org/) on darwin Ns 10.3.2113
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