from preamble:

"Change Set:		HierarchyNavigation-ar
Date:			15 October 2003
Author:			Andreas Raab

15 October (Ned Konz):

Added navigation by first letter/number. Merges work from
FileListCombinedFixes-nk changeset.

14 October (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 model's responsibility to invoke the
list's #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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