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
* 
	 * @see org.eclipse.birt.report.designer.ui.dialogs.IExpressionProvider#getDisplayText(java.lang.Object)
	 */
	public String getDisplayText( Object element )
	{
		if ( element instanceof Object[] )
		{
			if ( element instanceof Operator[] )
			{
				if ( element == OPERATORS_ASSIGNMENT )
				{
					return DISPLAY_TEXT_ASSIGNMENT;
				}
				else if ( element == OPERATORS_COMPARISON )
				{
					return DISPLAY_TEXT_COMPARISON;
				}
				else if ( element == OPERATORS_COMPUTATIONAL )
				{
					return DISPLAY_TEXT_COMPUTATIONAL;
				}
				else if ( element == OPERATORS_LOGICAL )
				{
					return DISPLAY_TEXT_LOGICAL;
				}
			}
			else if ( element instanceof ILocalizableInfo[] )
			{
				
				ILocalizableInfo info = ( (ILocalizableInfo[]) element )[1];