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/browsing/MembersView.java
}
		return null; 	
	}
	
	/*
	 * Implements method from IViewPart.
	 */
	public void saveState(IMemento memento) {
		super.saveState(memento);
		fMemberFilterActionGroup.saveState(memento);
	}	
	protected void restoreState(IMemento memento) {
		super.restoreState(memento);
		fMemberFilterActionGroup.restoreState(memento);
		getViewer().getControl().setRedraw(false);
		getViewer().refresh();
 		getViewer().getControl().setRedraw(true);
	}
	protected void hookViewerListeners() {
		super.hookViewerListeners();
		getViewer().addDoubleClickListener(new IDoubleClickListener() {
			public void doubleClick(DoubleClickEvent event) {
				TreeViewer viewer= (TreeViewer)getViewer();
				Object element= ((IStructuredSelection)event.getSelection()).getFirstElement();
				if (viewer.isExpandable(element))
					viewer.setExpandedState(element, !viewer.getExpandedState(element));
			}
		});
	}
	boolean isInputAWorkingCopy() {