Bug 89137 [JFace] - API Review - "temporary" API in AbstractTreeViewer
AbstractTreeViewer contains two methods documented as "temporary" internalRefresh(Widget, Object) internalAdd(Widget, Object, Object [])
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
ViewerFilter f = (ViewerFilter) iter.next();
				result = f.filter(this, parent, result);
			}
		}
		return result;
	}
	/**
	 * Returns this viewer's filters.
	 * 
	 * @return an array of viewer filters
	 */
	public ViewerFilter[] getFilters() {
		if (filters == null)
			return new ViewerFilter[0];
		ViewerFilter[] result = new ViewerFilter[filters.size()];
		filters.toArray(result);
		return result;
	}
	/**
	 * Returns the item at the given display-relative coordinates, or
	 * <code>null</code> if there is no item at that location.
	 * <p>
	 * The default implementation of this method returns <code>null</code>.
	 * </p>
	 * 
	 * @param x
	 *            horizontal coordinate
	 * @param y
	 *            vertical coordinate
	 * @return the item, or <code>null</code> if there is no item at the given