Bug 65762 [Viewers] Need to back out of change to AbstractTreeViewer.isExpandable
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
private Object element;
		private Item item;
	    UpdateItemSafeRunnable(Item item, Object element) {
	        this.item = item;
	        this.element = element;
	    }
		public void run() {
			doUpdateItem(item, element);
		}
	}
	/**