Bug 113938 Report is marked dirty when open/close cascading parameter dialog without doing any operation on it
description: Report is marked dirty when open/close cascading parameter dialog without doing any operation on it steps to reproduce: 1.new a cascading parameter group 2.save the reprot 3.double click the cascading parameter to bring out edit box 4.click OK to close edit box actual result: Report has been marked dirty expected result: No dirty marked for that no operations done in edit parameter dialog
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ExpressionProvider.java
private static final Operator[] OPERATORS_COMPUTATIONAL = new Operator[]{
			new Operator( "+", "ExpressionProvider.Operator.Add" ), 
			new Operator( "-", "ExpressionProvider.Operator.Sub" ), 
			new Operator( "*", "ExpressionProvider.Operator.Mult" ), 
			new Operator( "/", "ExpressionProvider.Operator.Dvides" ),  
			new Operator( "++ ", "ExpressionProvider.Operator.Inc", "++" ),  
			new Operator( "-- ", "ExpressionProvider.Operator.Dec", "--" ), 
	};
	
	private static final Operator[] OPERATORS_LOGICAL = new Operator[]{
			new Operator( "&&", "ExpressionProvider.Operator.And" ),  
			new Operator( "||", "ExpressionProvider.Operator.Or" )  
	};
	private static final String DISPLAY_TEXT_ASSIGNMENT = Messages.getString( "ExpressionProvider.Operators.Assignment" ); 	
	private static final String DISPLAY_TEXT_COMPARISON = Messages.getString( "ExpressionProvider.Operators.Comparison" ); 
	private static final String DISPLAY_TEXT_COMPUTATIONAL = Messages.getString( "ExpressionProvider.Operators.Computational" ); 
	private static final String DISPLAY_TEXT_LOGICAL = Messages.getString( "ExpressionProvider.Operators.Logical" ); 
	private static final Image IMAGE_OPERATOR = getIconImage( IReportGraphicConstants.ICON_EXPRESSION_OPERATOR );
	private static final Image IMAGE_COLUMN = getIconImage( IReportGraphicConstants.ICON_DATA_COLUMN );
	private static final Image IMAGE_METHOD = getIconImage( IReportGraphicConstants.ICON_EXPRESSION_METHOD );
	private static final Image IMAGE_STATIC_METHOD = getIconImage( IReportGraphicConstants.ICON_EXPRESSION_STATIC_METHOD );
	private static final Image IMAGE_MEMBER = getIconImage( IReportGraphicConstants.ICON_EXPRESSION_MEMBER );
	private static final Image IMAGE_STATIC_MEMBER = getIconImage( IReportGraphicConstants.ICON_EXPRESSION_STATIC_MEMBER );
	public static final String OPERATORS = Messages.getString( "ExpressionProvider.Category.Operators" );  
	public static final String DATASETS = Messages.getString( "ExpressionProvider.Category.DataSets" ); 
	public static final String PARAMETERS = Messages.getString( "ExpressionProvider.Category.Parameters" ); 
	public static final String NATIVE_OBJECTS = Messages.getString( "ExpressionProvider.Category.NativeObjects" );
	public static final String BIRT_OBJECTS = Messages.getString( "ExpressionProvider.Category.BirtObjects" );
	private static final String ALL = Messages.getString( "ExpressionProvider.Label.All" ); 
	private List dataSetList;