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
private JavaElementSorter fSorter= new JavaElementSorter();			
				public LexicalSortingAction() {
					super();
					WorkbenchHelp.setHelp(this, IJavaHelpContextIds.LEXICAL_SORTING_OUTLINE_ACTION);
					setText(JavaEditorMessages.getString("JavaOutlinePage.Sort.label")); 
					JavaPluginImages.setLocalImageDescriptors(this, "alphab_sort_co.gif"); 
					setToolTipText(JavaEditorMessages.getString("JavaOutlinePage.Sort.tooltip")); 
					setDescription(JavaEditorMessages.getString("JavaOutlinePage.Sort.description")); 
					
					boolean checked= JavaPlugin.getDefault().getPreferenceStore().getBoolean("LexicalSortingAction.isChecked"); 
					valueChanged(checked, false);
				}
				
				public void run() {
					valueChanged(isChecked(), true);
				}
				
				private void valueChanged(final boolean on, boolean store) {
					setChecked(on);
					BusyIndicator.showWhile(fOutlineViewer.getControl().getDisplay(), new Runnable() {
						public void run() {
							fOutlineViewer.setSorter(on ? fSorter : null);						}
					});
					if (store)
						JavaPlugin.getDefault().getPreferenceStore().setValue("LexicalSortingAction.isChecked", on); 
				}
			};
		class ClassOnlyAction extends Action {