The attached program works the same in McCLIM and Lispworks CLIM,
except McCLIM gets into an infinite loop (CMUCL latest) unless
incremental-redisplay
is enabled. The program just wants its displayed output to track resizing
the frame
from the window manager.

The attachment should run correctly. But then comment out the
:incremental-redisplay
as shown below and trouble is at hand.

(defclass test-pane (application-pane)
  ()
  (:default-initargs
   :display-function 'tpdf
   ;;; YIKES - in McCLIM; without this, infinite loop!!
   ; :incremental-redisplay t
   ; :display-time :command-loop
   ))

;;;
Paul