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/packageview/PackageExplorerActionGroup.java
super();
		fPart= part;
		IWorkbenchPartSite site = fPart.getSite();
		Shell shell= site.getShell();
		ISelectionProvider provider= site.getSelectionProvider();
		IStructuredSelection selection= (IStructuredSelection) provider.getSelection();
		setGroups(new ActionGroup[] {
			new NewWizardsActionGroup(site),
			fNavigateActionGroup= new NavigateActionGroup(fPart), 
			new ShowActionGroup(fPart), 
			fCCPActionGroup= new CCPActionGroup(fPart),
			new RefactorActionGroup(fPart),
			new ImportActionGroup(fPart),
			new GenerateActionGroup(fPart), 
			fBuildActionGroup= new BuildActionGroup(fPart),
			new JavaSearchActionGroup(fPart),
			new ProjectActionGroup(fPart), 
			fWorkingSetFilterActionGroup= new WorkingSetFilterActionGroup(part.getViewer(), JavaUI.ID_PACKAGES, shell, createTitleUpdater()),
			new LayoutActionGroup(part)});
		
		PackagesFrameSource frameSource= new PackagesFrameSource(fPart);
		FrameList frameList= new FrameList(frameSource);
		frameSource.connectTo(frameList);
			
		fZoomInAction= new GoIntoAction(frameList);
		fBackAction= new BackAction(frameList);
		fForwardAction= new ForwardAction(frameList);
		fUpAction= new UpAction(frameList);
		
		fRenameResourceAction= new RenameResourceAction(shell);