The new constant group MouseWheelBehavior in css.awt controls how a
awt widget should respons to mouse wheel operations: Ignore it
(SCROLL_DISABLED), use it for scrolling the widget's content if it
currently has the focus (SCROLL_FOCUS_ONLY), or use it for scrolling
even if the control doesn't have the focus (SCROLL_ALWAYS).
The usual suspects in css.awt (UnoControl*Model) which describe models
of scrollable controls have been updated to support this property.