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/typehierarchy/TypeHierarchyViewPart.java
/**
	 * Creates the context menu for the hierarchy viewers
	 */
	private void fillTypesViewerContextMenu(TypeHierarchyViewer viewer, IMenuManager menu) {
		JavaPlugin.createStandardGroups(menu);
		
		menu.appendToGroup(IContextMenuConstants.GROUP_SHOW, new Separator(GROUP_FOCUS));
		
		viewer.contributeToContextMenu(menu);
		
		if (fFocusOnSelectionAction.canActionBeAdded())
			menu.appendToGroup(GROUP_FOCUS, fFocusOnSelectionAction);
		menu.appendToGroup(GROUP_FOCUS, fFocusOnTypeAction);
		fActionGroups.setContext(new ActionContext(getSite().getSelectionProvider().getSelection()));
		fActionGroups.fillContextMenu(menu);
		fActionGroups.setContext(null);
	}
	/**
	 * Creates the context menu for the method viewer
	 */	
	private void fillMethodsViewerContextMenu(IMenuManager menu) {
		JavaPlugin.createStandardGroups(menu);
		
		fMethodsViewer.contributeToContextMenu(menu);
		if (fSelectedType != null &&  fAddStubAction.init(fSelectedType, fMethodsViewer.getSelection())) {
			menu.appendToGroup(IContextMenuConstants.GROUP_REORGANIZE, fAddStubAction);
		}
		fActionGroups.setContext(new ActionContext(getSite().getSelectionProvider().getSelection()));
		fActionGroups.fillContextMenu(menu);