Apply this patch only if middle-mouse clicks on preview-icons paste
instead of toggling when in fly-spell mode.  After version 21.2 of
Emacs, this should be fixed already.

--- /usr/local/emacs-21/share/emacs/21.1/lisp/textmodes/flyspell.el.old	Mon Jul 16 14:22:59 2001
+++ /usr/local/emacs-21/share/emacs/21.1/lisp/textmodes/flyspell.el	Wed Nov  7 16:18:54 2001
@@ -378,9 +378,7 @@
 	  (setq minor-mode-map-alist
 		(cons (cons 'flyspell-mode flyspell-mode-map)
 		      minor-mode-map-alist)))
-  (define-key flyspell-mode-map "\M-\t" 'flyspell-auto-correct-word)
-  (define-key flyspell-mode-map [(mouse-2)]
-    (function flyspell-correct-word/local-keymap)))
+  (define-key flyspell-mode-map "\M-\t" 'flyspell-auto-correct-word))
 
 
 ;; the name of the overlay property that defines the keymap