(atomic-change-group): Prevent undo list truncation.

lisp/ChangeLog

@@ -1,3 +1,7 @@
+2008-01-11  Richard Stallman  <rms@gnu.org>
+
+	* subr.el (atomic-change-group): Prevent undo list truncation.
+
 2008-01-11  Martin Rudalics  <rudalics@gmx.at>
 
 	* cus-start.el (all): Add missing version entries.

lisp/subr.el

@@ -1802,6 +1802,10 @@ user can undo the change normally."
   (let ((handle (make-symbol "--change-group-handle--"))
 	(success (make-symbol "--change-group-success--")))
     `(let ((,handle (prepare-change-group))
+	   ;; Don't truncate any undo data in the middle of this.
+	   (undo-outer-limit nil)
+	   (undo-limit most-positive-fixnum)
+	   (undo-strong-limit most-positive-fixnum)
 	   (,success nil))
        (unwind-protect
 	   (progn