#5 new config option for listbox type widgets

[Larry W. Virden]

It would be useful to have the ability to turn on a config option that would watch for keyboard input inside the listbox and reposition the view based on the user's input.

If there are other iwidgets that provide similar capability (display a subset of a longer 'list' of information) similar capability would be useful.

In MS Windows Explorer, one has this sort of capability when, for instance, displaying a directory containing a large number of files.