Bug 65762 [Viewers] Need to back out of change to AbstractTreeViewer.isExpandable
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
Item item = items[i];
			Object data = item.getData();
			if (data != null) {
				
				
				boolean expanded = expandedElements.remove(data) != null;
				if (expanded != getExpanded(item)) {
					if (expanded) {
						createChildren(item);
					}
					setExpanded(item, expanded);
				}
			}
			internalSetExpanded(expandedElements, item);
		}
	}
	/**
	 * Returns whether the tree node representing the given element can be
	 * expanded.
	 * <p>
	 * The default implementation of this framework method calls <code>hasChildren</code>
	 * on this viewer's content provider if there are no filters configured on this viewer.
	 * If there are filters configured, then it calls <code>getChildren</code> on this
	 * viewer's content provider and checks to see if any children remain after
	 * passing them through the filters. 
	 * </p>
	 * 
	 * @param element
	 *           the element
	 * @return <code>true</code> if the tree node representing the given