Bug 155766 [Regression]Preview will not refresh the modify in design report
Details: Preview will not refresh the modify in design report Step: 1.New a report design. 2.New a label and input label1. 3.Preview. 4.Switch to Layout and modify the content of label as label2. 5.Preview. Actual result: It preview as "label1" twice. Exception result: Preview "label2" at the second time
viewer/org.eclipse.birt.report.viewer/src/org/eclipse/birt/report/viewer/utilities/WebViewer.java
return createURL( "run", report, format, true, resourceFolder ); 
		}
		if ( servletName == null || servletName.trim( ).length( ) <= 0 )
		{
			if ( allowPage == null )
				servletName = "frameset"; 
			else
			{
				servletName = allowPage.booleanValue( ) ? "frameset" : "run"; 
			}
		}
		return createURL( servletName, report, format, true, resourceFolder );
	}
	/**
	 * Create web viewer url to run the report.
	 * 
	 * @param servletName
	 *            servlet name to viewer report
	 * @param report
	 *            report file name
	 * @param format
	 *            report format
	 * @param resourceFolder
	 *            the resource folder
	 * @return valid web viewer url
	 */
	private static String createURL( String servletName, String report,
			String format, boolean inDesigner, String resourceFolder )
	{
		String encodedReportName = null;