[cp-patches] Patch: JTree null root fix

[Lillian Angel]

For some reason, an exception was being thrown for a null root. It is
legal to set the root of a tree to null. This is now fixed. I took out
some revalidate calls that were not needed.

2005-12-20  Lillian Angel  <address@hidden>

        * javax/swing/plaf/basic/BasicTreeUI.java
        (pathWasExpanded): Removed unneeded revalidate call.
        (pathWasCollapsed): Likewise.
        (installUI): Fixed to check for null root.
        (paint): Fixed to always update path.
        (toggleExpandState): Removed call to update path.
        (editingStopped): Likewise.
        (editingCanceled): Likewise.
        (treeStructureChanged): Likewise.
        (treeExpanded): Likewise.
        (treeCollapsed): Likewise.
        (treeNodesChanged): Likewise.
        (treeNodesInserted): Likewise.
        (treeNodesRemoved): Likewise.
        (updateCurrentVisiblePath): Added check for null root. If root 
        is null, nothing should be painted or in the path.
        * javax/swing/tree/DefaultTreeModel.java
        (setRoot): Root can be null.

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