Bug 65762 [Viewers] Need to back out of change to AbstractTreeViewer.isExpandable
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
*           the element
	 * @return <code>true</code> if the node is expanded, and <code>false</code>
	 *         if collapsed
	 */
	public boolean getExpandedState(Object element) {
		Assert.isNotNull(element);
		Widget item = findItem(element);
		if (item instanceof Item)
			return getExpanded((Item) item);
		return false;
	}
	/**
	 * Returns the number of child items of the given SWT control.
	 * 
	 * @param control
	 *           the control
	 * @return the number of children
	 */
	protected abstract int getItemCount(Control control);
	/**
	 * Returns the number of child items of the given SWT item.
	 * 
	 * @param item
	 *           the item
	 * @return the number of children
	 */
	protected abstract int getItemCount(Item item);
	/**
	 * Returns the child items of the given SWT item.
	 *