bug#12034: 24.1.50; pp-display-expression may select deleted window

[Christopher Schmidt <christopher@ch.ristopher.com>]

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In pp-display-expression there is this sexp:

    (let ((temp-buffer-show-function old-show-function)
          (old-selected (selected-window))
          (window (display-buffer buf)))
                  ^^^^^^^^^^^^^^^^^^^^
      (goto-char (point-min)) ; expected by some hooks ...
      (make-frame-visible (window-frame window))
      (unwind-protect
          (progn
            (select-window window)
            (run-hooks 'temp-buffer-show-hook))
        (select-window old-selected)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        (message "See buffer %s." out-buffer-name)))

An user may implement an overriding action for display-buffer that could
delete old-selected.

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=== modified file 'lisp/ChangeLog'
--- lisp/ChangeLog	2012-07-22 21:14:12 +0000
+++ lisp/ChangeLog	2012-07-23 12:49:21 +0000
@@ -1,3 +1,8 @@
+2012-07-23  Christopher Schmidt  <christopher@ch.ristopher.com>
+
+	* emacs-lisp/pp.el (pp-display-expression): Select old selected
+	window only if it is still live (Bug#).
+
 2012-07-22  Vincent Belaïche  <vincentb1@users.sourceforge.net>
 
 	* ses.el (ses-cell-formula-aset): New macro.

=== modified file 'lisp/emacs-lisp/pp.el'
--- lisp/emacs-lisp/pp.el	2012-02-05 02:09:35 +0000
+++ lisp/emacs-lisp/pp.el	2012-07-23 12:44:07 +0000
@@ -110,7 +110,8 @@
 			 (progn
 			   (select-window window)
 			   (run-hooks 'temp-buffer-show-hook))
-		       (select-window old-selected)
+		       (when (window-live-p old-selected)
+			 (select-window old-selected))
 		       (message "See buffer %s." out-buffer-name)))
 		 (message "%s" (buffer-substring (point-min) (point)))
 		 ))))))


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        Christopher