from preamble:

"Change Set:		PackagePaneBrowser-one-segment-category-fix
Date:			30 July 2003
Author:			Julian Fitzell

When someone creates a category (say Foo) as well as some sub-categories
(like Foo-Bar), the PackagePaneBrowser won't show you the classes in Foo
when you select Foo in the first column.  This fixes is so that it will.
 As long as you have nothing selected in the second column, the browser
will show you the classes that are in the base package selected in the
first column.

This involved a little refactoring so some predicate methods were added
for clarity.  More work could be done in this area."!
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