Bold spans in TextPane result in bad word breaking

If you have a mixture of plain and bold spans of text in a paragraph, the bold spans don't behave properly with respect to line breaking – the system will happily break a line in the middle of a bold word (though apparently this happens only for the first word in a bold span), and in particularly perverse cases will place the first character of a bold word at the start of a line and then break immediately after it.

Here's a test case I made:

<Window maximized="true"
xmlns:bxml="http://pivot.apache.org/bxml"
xmlns="org.apache.pivot.wtk">
<TextPane>
<Document xmlns="org.apache.pivot.wtk.text">
<Paragraph>
<Span>This paragraph has some words in </Span>
<Span font="

">bold</Span>
<Span>, and if you </Span>
<Span font="

">reshape the window</Span>
<Span> to certain widths, they will break poorly.</Span>
</Paragraph>
</Document>
</TextPane>
</Window>