=== modified file 'lisp/window.el'
--- trunk/lisp/window.el	2010-06-07 18:28:02 +0000
+++ patched/lisp/window.el	2010-06-09 18:48:37 +0000
@@ -1502,10 +1502,12 @@
 			     (forward-line 0))
 			   (point))))
 		(set-window-vscroll window 0)
+                (redisplay t)
 		(while (and (< desired-height max-height)
 			    (= desired-height (window-height))
 			    (not (pos-visible-in-window-p end)))
 		  (enlarge-window 1)
+                  (redisplay t)
 		  (setq desired-height (1+ desired-height))))
 	      ;; Return non-nil only if nothing "bad" happened.
 	      (setq value t)))