Bug 172019 [Viewers] Plus sign doesn't disappear when using deferred content providers
3.3 M4 Use a tree viewer with a content provider using IDeferredWorkbenchAdapter and DeferredTreeContentManager. When fetchDeferredChildren is call and no elements are reported to the element collector the plus sign of the node doesn't disappear. This work without problems under Windows and Mac/OS (e.g. the plus sign disappears).
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
/**
	 * Updates the tree items to correspond to the child elements of the given
	 * parent element. If null is passed for the children, this method obtains
	 * them (only if needed).
	 * 
	 * @param widget
	 *            the widget
	 * @param parent
	 *            the parent element
	 * @param elementChildren
	 *            the child elements, or null
	 * @deprecated this is no longer called by the framework
	 */
	protected void updateChildren(Widget widget, Object parent,
			Object[] elementChildren) {
		updateChildren(widget, parent, elementChildren, true);
	}
	/**
	 * Updates the tree items to correspond to the child elements of the given
	 * parent element. If null is passed for the children, this method obtains
	 * them (only if needed).
	 * 
	 * @param widget
	 *            the widget
	 * @param parent
	 *            the parent element
	 * @param elementChildren
	 *            the child elements, or null
	 * @param updateLabels
	 *            <code>true</code> to update labels for existing elements,