Added two new events to tools.ScrollbarWatcher: toggleverticalscrollbar and togglehorizontalscrollbar
Added two new events to tools.ScrollbarWatcher: toggleverticalscrollbar
and togglehorizontalscrollbar

Invoked when scrollbars are added or removed.
The Event obeject has a property "scrollbarSize" refering to either the
width or height of the scrollbar depending on orientation.

klale/tiki-widgets