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/UnorderedTreeContentProvider.java
removeIfUnused(nextNode);
				}
			}
			if (lastElement || useRefresh) {
				treeViewer.refresh(element);
			} else {
				treeViewer.remove(element, removals.toArray());
			}
		}
	}
	void add(TreePath treePath, Set additions) {
		if (avoidViewerUpdates == 0) {
			
			addParent(treePath, additions);
			if (useRefresh) {
				treeViewer.refresh(treePath);
			} else {
				treeViewer.add(treePath, additions.toArray());
			}
		}
	}
	/**
	 * Ensures that the given set of children have the given parent as one of
	 * their parents.
	 * 
	 * @param parent
	 * @param children
	 */
	private void addParent(TreePath parent, Set children) {
		for (Iterator iter = children.iterator(); iter.hasNext();) {