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
try
		{
			setFormatValue( HighlightRule.DATE_TIME_FORMAT_MEMBER,
					FormatValue.PATTERN_MEMBER, pattern );
		}
		catch ( SemanticException e )
		{
			assert false;
		}
	}
	/**
	 * Sets the category of a number format for a highlight rule. The
	 * <code>pattern</code> can be one of:
	 * 
	 * <ul>
	 * <li><code>DesignChoiceConstants.DATETIEM_FORMAT_TYPE_UNFORMATTED</code>
	 * <li><code>DesignChoiceConstants.DATETIEM_FORMAT_TYPE_GENERAL_DATE</code>
	 * <li><code>DesignChoiceConstants.DATETIEM_FORMAT_TYPE_LONG_DATE</code>
	 * <li><code>DesignChoiceConstants.DATETIEM_FORMAT_TYPE_MUDIUM_DATE</code>
	 * <li><code>DesignChoiceConstants.DATETIEM_FORMAT_TYPE_SHORT_DATE</code>
	 * <li><code>DesignChoiceConstants.DATETIEM_FORMAT_TYPE_LONG_TIME</code>
	 * <li><code>DesignChoiceConstants.DATETIEM_FORMAT_TYPE_MEDIUM_TIME</code>
	 * <li><code>DesignChoiceConstants.DATETIEM_FORMAT_TYPE_SHORT_TIME</code>
	 * <li><code>DesignChoiceConstants.DATETIEM_FORMAT_TYPE_CUSTOM</code>
	 * </ul>
	 * 
	 * @param pattern
	 *            the category of a date-time format
	 * @throws SemanticException
	 *             if <code>pattern</code> is not one of the above values.