J2SE Version (please include all output from java -version flag):
java version "1.6.0_01"
Java(TM) SE Runtime Environment (build 1.6.0_01-b06)
Java HotSpot(TM) Client VM (build 1.6.0_01-b06, mixed mode, sharing)

Does this problem occur on J2SE 1.4.x or 5.0.x or 6.0? Yes / No (pick one)
Yes

Operating System Configuration Information (be specific):
Microsoft Windows XP [Version 5.1.2600]

ListSelectionModel's getAnchorSelectionIndex()/getLeadSelectionIndex() JavaDoc's are now wrong

ListSelectionModel's getAnchorSelectionIndex() says:
Return the first index argument from the most recent call to setSelectionInterval(), addSelectionInterval() or removeSelectionInterval().
It needs to also include setLeadSelectionIndex(int anIndex).

We were relying on the selection and lead selection to always be in sync, however now
they are no longer in sync
as setLeadSelectionIndex(int anIndex) is getting called with
-1 and leaving the selection unchanged.
Bug 5053379 is possibly related to this as well.