Bug 305703 [Viewers][CommonNavigator] remembered contributions can leak when using filters
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
if (indexOfItem == 0) {
					if(length == 1) {
						elementMap.remove(element);
					} else {
						Widget[] updatedWidgets = new Widget[length - 1];
						System.arraycopy(widgets, 1, updatedWidgets, 0, length -1 );
						elementMap.put(element, updatedWidgets);
					}
				} else {
					Widget[] updatedWidgets = new Widget[length - 1];
					System.arraycopy(widgets, 0, updatedWidgets, 0, indexOfItem);
					System.arraycopy(widgets, indexOfItem + 1, updatedWidgets, indexOfItem, length - indexOfItem - 1);
					elementMap.put(element, updatedWidgets);
				}
			}
		}
	}
	
	private boolean refreshOccurred;
	
	/**
	 * Updates the given elements' presentation when one or more of their
	 * properties change. Only the given elements are updated.
	 * <p>
	 * This does not handle structural changes (e.g. addition or removal of
	 * elements), and does not update any other related elements (e.g. child
	 * elements). To handle structural changes, use the <code>refresh</code>
	 * methods instead.
	 * </p>
	 * <p>