Bug 132786 Value2 should be cleaned after convert operator from between to equal in highlight rule.
Description: Value2 should be cleaned after convert operator from between to equal in highlight rule. Steps to reproduce: 1. Insert a data. 2. Set highlight rule in Property Editor. 2 between 1 and 3, color blue. 3. Save the report 4. Modify highlight rule, change to 1 equal 1, color blue. 5. Save the report, see generated xml source. Expected result: In xml source, value2 should be cleaned in highlight expression. Actual result: In xml source, value1 is 1 and value2 is 3.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/HighlightRuleHandle.java
* 
 * @see ColorHandle
 * @see DimensionHandle
 * @see FontHandle
 * @see org.eclipse.birt.report.model.api.elements.structures.HighlightRule
 * @see org.eclipse.birt.report.model.api.elements.DesignChoiceConstants
 */
public class HighlightRuleHandle extends StyleRuleHandle
{
	/**
	 * Constructs a highlight rule handle with the given
	 * <code>SimpleValueHandle</code> and the index of the highlight rule in
	 * the highlight.
	 * 
	 * @param valueHandle
	 *            handle to a list property or member
	 * @param index
	 *            index of the structure within the list
	 */
	public HighlightRuleHandle( SimpleValueHandle valueHandle, int index )
	{
		super( valueHandle, index );
	}
	/**
	 * Returns a handle to work with the color property.
	 * 
	 * @return a ColorHandle to deal with the color.
	 */
	public ColorHandle getColor( )
	{