Bug 184755 [DataBinding] internal tree content provider does not work
I broke the tree content providers while trying to update them to use TreePaths. It would be good to have a working implementation again...
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/internal/viewers/UnorderedTreeNode.java
/**
     * Disposes this node and removes all remaining children.
     */
    public void dispose() {
        if (children != null) {
            if (listeningToChildren) {
                contentProvider.remove(treePath, children, true);
                children.removeSetChangeListener(this);
                children.removeStaleListener(this);
            }
            children.dispose();
            children = null;
            
            if (listeningToChildren && isStale) {
                contentProvider.changeStale(-1);
            }
        }
    }
    
    /**
     * @return <code>true</code> if this node is disposed
     */
    public boolean isDisposed() {
        return children == null;
    }
    
    /**
     * Returns one representative parent, or null if this node is unparented. Use
     * getParents() to get the complete set of known parents.