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bug#4887: 23.1; list-load-path-shadows produces broken buffer

From: Mark Lillibridge
Subject: bug#4887: 23.1; list-load-path-shadows produces broken buffer
Date: Sat, 7 Nov 2009 21:34:54 -0800

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

* turn on global-linum-mode
* run list-load-path-shadows
* observe that the resulting buffer, *Shadows*, has no line numbering,
  even if you change into that buffer, move around, and change text.   [BUG]

Some debugging shows that:

*Shadows* has a post-command-hook value (^h v) of nil, when it should
contain (linum-update-current t) locally and
(... global-linum-mode-check-buffers) globally.

Looking at the source code shows that the following code creates the
buffer *Shadows*:

            ;; Create the *Shadows* buffer and display shadowings there.
            (let ((output-buffer (get-buffer-create "*Shadows*")))
              (display-buffer output-buffer)
              (set-buffer output-buffer)
              (while shadows
                (insert (format "%s hides %s\n" (car shadows)
                                (car (cdr shadows))))
                (setq shadows (cdr (cdr shadows))))
              (insert msg "\n")))

Some experimentation shows that the offending code is: 

   (get-buffer-create "*Shadows*")

If you just run this via eval-expression, a new buffer called *Shadows*
is created with a broken value of post-command-hook.  I do not appear to
have source code for this function, so I leave the rest of the debugging
job to you...

- Mark

In GNU Emacs 23.1.1 (i386-mingw-nt6.0.6002)
 of 2009-07-29 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 6.0.6002
configured using `configure --with-gcc (4.4)'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default-enable-multibyte-characters: t

Major mode: Text

Minor modes in effect:
  global-linum-mode: t
  linum-mode: t
  delete-selection-mode: t
  pc-selection-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

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