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
return doGetColorHandle( HighlightRule.COLOR_MEMBER );
	}
	/**
	 * Returns a handle to work with the background color.
	 * 
	 * @return a ColorHandle to deal with the background color.
	 */
	public ColorHandle getBackgroundColor( )
	{
		return doGetColorHandle( HighlightRule.BACKGROUND_COLOR_MEMBER );
	}
	/**
	 * Returns a handle to work with the border top color.
	 * 
	 * @return a ColorHandle to deal with the border top color.
	 */
	public ColorHandle getBorderTopColor( )
	{
		return doGetColorHandle( HighlightRule.BORDER_TOP_COLOR_MEMBER );
	}
	/**
	 * Returns a handle to work with the border left color.
	 * 
	 * @return a ColorHandle to deal with the border left color.
	 */
	public ColorHandle getBorderLeftColor( )
	{
		return doGetColorHandle( HighlightRule.BORDER_LEFT_COLOR_MEMBER );
	}
	/**