Text shows extra blank line when using StyledText starting with <h1>

The example below puts an extra blank line before the text.

If I change it to RichText (or PlainText) it is ok.

Also ok if I don't use the <h1>.

import QtQuick 2.1

Text {
    text: "<h1>hello world</h1>"
    textFormat: Text.StyledText
}