Bug 33040 No single Undo for generate delegate methods
RC 1 - JUnit setup - open TestCase - select fName - generate delegate methods for all String methods - press Ctrl+Z Observe: only one method is removed.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/AddUnimplementedConstructorsAction.java
/**
	 * Note: This constructor is for internal use only. Clients should not call this constructor.
	 */
	public AddUnimplementedConstructorsAction(CompilationUnitEditor editor) {
		this(editor.getEditorSite());
		fEditor= editor;
		setEnabled(checkEnabledEditor());
	}
	
	
	
	/* (non-Javadoc)
	 * Method declared on SelectionDispatchAction
	 */
	protected void selectionChanged(IStructuredSelection selection) {
		boolean enabled= false;
		try {
			enabled= getSelectedType(selection) != null;
		} catch (JavaModelException e) {
			
			if (JavaModelUtil.filterNotPresentException(e))
				JavaPlugin.log(e);			
		}
		setEnabled(enabled);
	}
	/* (non-Javadoc)
	 * Method declared on SelectionDispatchAction
	 */
	protected void run(IStructuredSelection selection) {
		Shell shell= getShell();