bug#12648: 24.2.50; display-buffer switches to another frame

[Eli Zaretskii <eliz@gnu.org>]

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Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

 emacs -Q
 C-x b foo
 C-x 5 b bar

Now you have 2 frames, one displays the buffer "foo", the other
displays the buffer "bar" and is the selected frame.

 M-: (display-buffer "foo" nil 'visible) RET

This quite unexpectedly selects the frame which displays "foo".  But
display-buffer is not supposed to select the window where it displays
the buffer.  And indeed, if the same experiment is repeated when the
same frame displays "foo" and "bar" in 2 different windows, the window
that shows "bar" being the selected one, display-buffer does not
select the other window, as expected.

This is an annoyance when you use GUD with the GDB interaction buffer
on one frame and the source on another.  Each command that moves
through the program, such as 'n', 's', etc., switches to the source
frame, which is inconvenient.  See

  http://lists.gnu.org/archive/html/help-gnu-emacs/2012-10/msg00188.html

for the original complaint.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
d:/gnu/bzr/emacs/trunk/etc/DEBUG.


In GNU Emacs 24.2.50.1 (i386-mingw-nt5.1.2600)
 of 2012-10-14 on HOME-C4E4A596F7
Bzr revision: 110541 monnier@iro.umontreal.ca-20121014014248-jy0lxhbhkiihxjy0
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
 `configure --with-gcc (3.4) --no-opt --enable-checking --cflags
 -Id:/usr/include/libxml2 -DGLYPH_DEBUG=1'

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1255
  default enable-multibyte-characters: t

Major mode: Fundamental

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

Recent input:
C-x b f o o <return> C-x 5 b b a r <return> M-: ( d 
i s p l a y - b u f f e r SPC " f o o " S-SPC ' <backspace> 
n i l SPC ' v i s i b l e ) <return> <switch-frame> 
<help-echo> M-x r e p o r t - e m <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
#<window 3 on foo>

Load-path shadows:
None found.

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