"Change Set:		HierarchyNavigation-ar
Date:			14 October 2003
Author:			Andreas Raab

Adds default keyboard navigation for hierarchical lists. If no
keystrokeSelector is set, the default keyboard navigation is used. If a
keystrokeSelector is set, it is the models responsibility to invoke the
lists #arrowKey: method if keyboard navigation is desired.

The effect is (for example) immediately noticable in the file list and the
object explorer"
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