Bug 167450 [DataBinding] Get rid of bind support factory magic
I finally realized that we don't need that other magic factory. I'll move fillBindSpecDefaults() and the methods it calls (createConverter, createValidator etc) to a new class DefaultBindSpec. Clients who want default validators and converters created for them just create a DefaultBindSpec as opposed to a (rather empty) BindSpec. I will also move the early type checking into DefaultBindSpec to make it optional as well.
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/viewers/OrderedTreeNode.java
/**
	 * Returns the list of children for this node. If new children are
	 * discovered later, they will be added directly to the viewer.
	 * 
	 * @return
	 */
	public List getChildren() {
		if (!listeningToChildren) {
			listeningToChildren = true;
			children.addListChangeListener(this);
			hasPendingNode = children.isEmpty() && children.isStale();
			children.addStaleListener(this);
			updateStale();
		}
		
		if (hasPendingNode) {
			Object pendingNode = contentProvider.getPendingNode();
			return Collections.singletonList(pendingNode);
		}
		return children;
	}
	/**
	 * @return
	 */
	public IObservableList getChildrenList() {
		return children;
	}
	private void updateStale() {
		boolean willBeStale = children.isStale();
		if (willBeStale != isStale) {