QFontMetrics::boundingRect() does not account for QFont::setLetterSpacing()

Try the following code:

QFont testFont;
qDebug() << QFontMetrics(testFont).size(0, "abcdefg") << QFontMetrics(testFont).boundingRect("abcdefg");
testFont.setLetterSpacing(QFont::PercentageSpacing, 200);
qDebug() << QFontMetrics(testFont).size(0, "abcdefg") << QFontMetrics(testFont).boundingRect("abcdefg");

In the first qDebug output, the numbers will be fairly similar; in the second, the boundingRect will be much narrower.