Bug 65762 [Viewers] Need to back out of change to AbstractTreeViewer.isExpandable
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
if (w == null) {
			if (equals(element, getRoot())) { 
				return null;
			}
			
			ITreeContentProvider cp =
				(ITreeContentProvider) getContentProvider();
			if (cp == null) {
				return null;
			}
			Object parent = cp.getParent(element);
			if (parent != null) {
				Widget pw = internalExpand(parent, expand);
				if (pw != null) {
					
					createChildren(pw);
					
					if (pw instanceof Item) {
						Item item = (Item) pw;
						if (expand)
							setExpanded(item, true);
						w = internalFindChild(item, element);
					}
				}
			}
		}
		return w;
	}
	/**
	 * Recursively expands the subtree rooted at the given widget to the given