Large weights not reflected in combo pool preview panel

Steps to recreate:

1. File->New
2. Set drawing mode to Pool
3. rclick pool #0 in the combo lists
4. click 'Edit Pool' in the context menu
5. Set a weight to 65535
6. Click 'Ok'
7. Make sure pool preview below combo lists is set to 'Weighted'
8. Observe only 68 pools (4 rows; 17 columns) are previewed

The fact that there is no scrollbar in the combo pool preview panel creates the impression that there are only 68 pools.