Bug 55604 [implementation] JavaOutlinePage should dispose CustomFiltersActionGroup
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaOutlinePage.java
private boolean fReorderedMembers;
				private boolean fForceFireSelectionChanged;
				
				public JavaOutlineViewer(Tree tree) {
					super(tree);
					setAutoExpandLevel(ALL_LEVELS);
					setUseHashlookup(true);
				}
				
				/**
				 * Investigates the given element change event and if affected incrementally
				 * updates the outline.
				 */
				public void reconcile(IJavaElementDelta delta) {
					fReorderedMembers= false;
					fForceFireSelectionChanged= false;
					if (getSorter() == null) {
						if (fTopLevelTypeOnly
							&& delta.getElement() instanceof IType
							&& (delta.getKind() & IJavaElementDelta.ADDED) != 0)
						{
							refresh(true);
						} else {
							Widget w= findItem(fInput);
							if (w != null && !w.isDisposed())
								update(w, delta);
							if (fForceFireSelectionChanged)
								fireSelectionChanged(new SelectionChangedEvent(getSite().getSelectionProvider(), this.getSelection()));
							if (fReorderedMembers) {
								refresh(false);