smoothly scrolling images?

Hi,

I get some annoying artifacts when using images in a scrollable pane/ 
layout. I tried to experiment with some "safe" code and found the  
"image.lisp" example file. If I add :vertical-scroll  to the layout  
definition below I get the same artifacts when scrolling than I do in  
my own code. What is the correct way to implement a layout with text  
and images that can be scrolled smoothly? I am in LWM 4.4.6.

(capi:define-interface test-image-functions ()
   ((image :initform nil))
   (:panes
    (viewer capi:output-pane
            :display-callback 'display-test-image-functions
            :horizontal-scroll t
            :vertical-scroll t
            :visible-min-width 500
            :visible-min-height 375)
    (controller capi:push-button-panel
                :items '(:change... :close)
                :callbacks '(test-image-functions-change-image
                             test-image-functions-close-image)
                :callback-type :interface
                :print-function 'string-capitalize))
   (:layouts
    (main-layout capi:column-layout
                 '(viewer controller) :vertical-scroll t))   ;;;  
<------- ADDED vertical-scroll t HERE
   (:default-initargs
    :layout 'main-layout
    :best-width 200
    :best-height 200))


Mika Kuuskankare
Researcher
Department of Doctoral Studies in Musical Performance and Research
Sibelius Academy

Henkilökohtainen postiosoite/Personal post address
PL 342 - PO Box 342
FIN-00121 Helsinki, FINLAND
Tel: +358 (0)40 5415 233
Skype: mkuuskan