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
*/
	public void addFilter( ExpressionFilter filter )
	{
		if ( filterList == null )
		{
			filterList = new ArrayList( );
		}
		if ( !filterList.contains( filter ) )
		{
			filterList.add( filter );
		}
	}
	/**
	 * Adds a filter list for this expression builder.
	 * 
	 * @param list
	 *            the list of the filter to add
	 */
	public void addFilterList( List list )
	{
		
		if ( list == null )
		{
			return;
		}
		for ( Iterator iter = list.iterator( ); iter.hasNext( ); )
		{
			Object obj = iter.next( );
			if ( obj instanceof ExpressionFilter )
			{