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
fMemberFilterActionGroup= new MemberFilterActionGroup(fOutlineViewer, "JavaOutlineViewer"); 
			fMemberFilterActionGroup.contributeToToolBar(toolBarManager);
		}
	}
	
	/*
	 * @see IPage#createControl
	 */
	public void createControl(Composite parent) {
		
		Tree tree= new Tree(parent, SWT.MULTI);
		ILabelProvider lprovider= new AppearanceAwareLabelProvider(
			AppearanceAwareLabelProvider.DEFAULT_TEXTFLAGS |  JavaElementLabels.F_APP_TYPE_SIGNATURE,
			AppearanceAwareLabelProvider.DEFAULT_IMAGEFLAGS,
			AppearanceAwareLabelProvider.getDecorators(true, new OverrideIndicatorLabelDecorator(null))
		);
		fOutlineViewer= new JavaOutlineViewer(tree);		
		fOutlineViewer.setContentProvider(new ChildrenProvider());
		fOutlineViewer.setLabelProvider(new DecoratingLabelProvider(lprovider, PlatformUI.getWorkbench().getDecoratorManager().getLabelDecorator()));
		
		Object[] listeners= fSelectionChangedListeners.getListeners();
		for (int i= 0; i < listeners.length; i++) {
			fSelectionChangedListeners.remove(listeners[i]);
			fOutlineViewer.addSelectionChangedListener((ISelectionChangedListener) listeners[i]);
		}
				
		MenuManager manager= new MenuManager(fContextMenuID, fContextMenuID);
		manager.setRemoveAllWhenShown(true);
		manager.addMenuListener(new IMenuListener() {
			public void menuAboutToShow(IMenuManager manager) {