Significant whitespace-only text node in the report HTML does not have style

[AirQuick]

	<x:scenario label="Test">
		<x:call function="one-or-more">
			<x:param>
				<ordinary-text>foo</ordinary-text>
				<whitespace-only-text xml:space="preserve">&#x09;&#x0A;&#x0D;&#x20;</whitespace-only-text>
			</x:param>
		</x:call>
		<x:expect label="Fail deliberately" />
	</x:scenario>

In the report HTML, /whitespace-only-text/text() is not highlighted whereas /ordinary-text/text() is highlighted by the diff class. They should work in the same way.