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
/**
	 * Returns a handle to work with the width of the right side of the border.
	 * 
	 * @return DimensionHandle to deal with the width of the right side of the
	 *         border.
	 */
	public DimensionHandle getBorderRightWidth( )
	{
		return doGetDimensionHandle( HighlightRule.BORDER_RIGHT_WIDTH_MEMBER );
	}
	/**
	 * Returns a handle to work with the width of the bottom side of the border.
	 * 
	 * @return a DimensionHandle to deal with the width of the bottom side of
	 *         the border.
	 */
	public DimensionHandle getBorderBottomWidth( )
	{
		return doGetDimensionHandle( HighlightRule.BORDER_BOTTOM_WIDTH_MEMBER );
	}
	/**
	 * Returns a handle to work with the font size.
	 * 
	 * @return a aDimensionHandle to deal with the font size.
	 */
	public DimensionHandle getFontSize( )
	{
		return doGetDimensionHandle( HighlightRule.FONT_SIZE_MEMBER );
	}
	/**