Bug 25827 Disposing of MemberFilterActionGroup
Build 2.0.2 and 2.1 When investigating an editor memory leak PR we found out that this group has a dispose method which is never called. When we then called from the editor it throw an exeption (viewer was disposed). Don't know if the group really needs dispose() if so it should get called.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaOutlinePage.java
* Investigates the given element change event and if affected incrementally
				 * updates the outline.
				 */
				public void reconcile(IJavaElementDelta delta) {
					if (getSorter() == null) {
						if (fTopLevelTypeOnly
							&& delta.getElement() instanceof IType
							&& (delta.getKind() & IJavaElementDelta.ADDED) != 0)
						{
							refresh();
						} else {
							Widget w= findItem(fInput);
							if (w != null && !w.isDisposed())
								update(w, delta);
						}
					} else {
						
						refresh();
					}
				}
				
				/*
				 * @see TreeViewer#internalExpandToLevel
				 */
				protected void internalExpandToLevel(Widget node, int level) {
					if (node instanceof Item) {
						Item i= (Item) node;
						if (i.getData() instanceof IJavaElement) {
							IJavaElement je= (IJavaElement) i.getData();
							if (je.getElementType() == IJavaElement.IMPORT_CONTAINER || isInnerType(je)) {