Background color and kern

[pgundlach]

<?xml version="1.0" encoding="UTF-8"?>
<Layout xmlns="urn:speedata.de:2009/publisher/en" xmlns:sd="urn:speedata:2009/publisher/functions/en">
    <Pageformat height="5cm" width="7cm" />

    <LoadFontfile mode="harfbuzz" name="amiri" filename="amiri-regular.ttf" />

    <DefineFontfamily name="text" fontsize="8" leading="18">
        <Regular fontface="amiri" />
    </DefineFontfamily>

    <Stylesheet>.bg { background-color: #E0E0E0; } </Stylesheet>

    <Record element="data">
        <Output>
            <Text fontfamily="text">
                <Paragraph language='Other' bidi="yes" direction="rtl">
                    <Span class='bg'>
                        <Value> وَلَكِنَّهُ عَلَى وَشْكِ أَنْ يَطْلُعَ مِنَ الْهَاوِيَةِ وَيَمْضِيَ إِلَى الْهَلاَكِ</Value>
                    </Span>
            </Paragraph>
            </Text>
        </Output>
    </Record>

</Layout>

(4.7.5)

gives