Bug 122941 Group interval range resets to 1
1. Create a group based on orders.orderNumber. 2. Specify an interval range of 100. 3. Do not check "Use fixed base value for interval" 4. Preview the report. Report groups on every order number. 5. Open the group editor. The interval range is set to 1.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
tocArea.setLayout( UIUtil.createGridLayoutWithoutMargin( 2, false ) );
		
		tocEditor = new Text( tocArea, SWT.SINGLE | SWT.BORDER );
		tocEditor.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		Button exprButton = new Button( tocArea, SWT.PUSH );
		exprButton.setText( "..." ); 
		exprButton.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent event )
			{
				ExpressionBuilder expressionBuilder = new ExpressionBuilder( tocEditor.getText( ) );
				expressionBuilder.setExpressionProvier( new ExpressionProvider( dataSetList ) );
				if ( expressionBuilder.open( ) == OK )
				{
					tocEditor.setText( expressionBuilder.getResult( ) );
				}
			}
		} );
	}
	/**
	 * Creates the title area
	 * 
	 * @param parent
	 *            the parent composite
	 */
	private void createTitleArea( Composite parent )
	{
		int margins = 2;
		final Composite titleArea = new Composite( parent, SWT.NONE );
		FormLayout layout = new FormLayout( );
		layout.marginHeight = margins;