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 class Operator
	{
		/**
		 * The tooltip of the operator
		 */
		public String tooltip;
		/**
		 * The symbol of the operator
		 */
		public String symbol;
		/**
		 * The text to insert into the source viewer
		 */
		public String insertText;
		Operator( String symbol, String tooltipKey )
		{
			this.symbol = symbol;
			insertText = symbol;
			this.tooltip = Messages.getString( tooltipKey );
		}
		Operator( String symbol, String tooltipKey, String insertText )
		{
			this( symbol, tooltipKey );
			this.insertText = insertText;
		}
	}
	private static final String[] OPERATORS_ON_BAR = new String[]{
			"+",