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View-quit in *Help* restores wrong window when display-buffer-reuse-fram

From: David Reitter
Subject: View-quit in *Help* restores wrong window when display-buffer-reuse-frames is t
Date: Sat, 13 Oct 2007 18:28:48 +0100

I received the bug report below from an Aquamacs user.

A little investigation traced this to the setting of `display-buffer- reuse-frames', which, when t, causes "View-quit" to do the wrong thing when restoring the previous window configuration. In this case, the second window in the frame gets deleted, but the first window switches to a different buffer.

The following should reproduce it in a 22 branch CVS Emacs (with unrelated patches - I tried Aquamacs with -Q) and also in a 23 one (I tried Adrian Robert's Cocoa port):

  (setq display-buffer-reuse-frames t)
  (other-window 1)

Begin forwarded message:

From: Paul Curry <address@hidden>
Date: 10 October 2007 05:25:58 BDT
To: address@hidden
Subject: [Aquamacs-bugs] View-quit in *Help* restores wrong window

Enter your bug report here.

When I quit from a *Help* buffer (key q, command View-quit) in Aquamacs
I do not get the correct (or at least expected) behavior.  In other
Emacsen, if you have two buffers open in a frame -- one of which is a
*Help* buffer -- and you quit the help buffer, then the frame will fill
out to only include the other visible buffer.  In Aquamacs, however,
View-quit fills the frame with a seemingly random unrelated buffer.

For testing purposes I tried the following sequence of commands in
both Aquamacs and Carbon Emacs:
Start Emacs
In Carbon Emacs I return to the *scratch* buffer, as expected; in
Aquamacs I change to the *Messages* buffer.  This is reproducible
every time.

Curious, I checked out the source code for View-quit in both Emacsen
-- they were the same.  view-mode-exit (called from View-quit) was
also the same.  The only difference that I can notice is the value of
view-return-to-alist.  In Carbon Emacs it is:
((#<window 8 on *Help*> #<window 3 on *scratch*> . t))
and in Aqumacs it's:
((#<window 7 on *Help*> #<window 3 on *scratch*> . quit-window))

My configuration is:
Aquamacs 1.2
OS X 10.4
not using one-buffer-one-frame-mode
opening the *Help* buffer in the current frame
hundreds of lines of elisp configuration
     (I hope this isn't the problem)

In GNU Emacs (i386-apple-darwin8.10.1, Carbon Version 1.6.0)
  of 2007-10-01 on plume.sr.unh.edu - Aquamacs Distribution 1.2a
Windowing system distributor `Apple Inc.', version 10.4.10
configured using `configure  '--without-x' '--prefix=/usr/local''

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: nil
   locale-coding-system: iso-8859-1
   default-enable-multibyte-characters: t

Major mode: Text

Minor modes in effect:
   flyspell-mode: t
   auto-insert-mode: t
   smart-frame-positioning-mode: t
   aquamacs-styles-mode: t
   recentf-mode: t
   encoded-kbd-mode: t
   show-paren-mode: t
   delete-selection-mode: t
   pc-selection-mode: t
   cua-mode: t
   auto-image-file-mode: t
   tooltip-mode: t
   mac-input-method-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
   unify-8859-on-encoding-mode: t
   utf-translate-cjk-mode: t
   auto-compression-mode: t
   column-number-mode: t
   line-number-mode: t
   transient-mark-mode: t

Recent input:
<down-mouse-1> <mouse-1> C-x C-g <menu-bar> <help-menu>
<report-emacs-bug> C-x C-f <return> C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-p C-p <return> M-b
M-b M-< M-< M-< M-< M-> M-> M-< M-x C-g M-x M-g <menu-bar>
<help-menu> <report-emacs-bug> C-g C-g <menu-bar> <help-menu>

Recent messages:
Public License, version 3 or later. Copyright (C) 2007 Free Software
Inc. (C) 2007 D. Reitter. No Warranty.
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