Setting the font of a QTextEdit has no effect after changing QTextDocument objects

In the following example the text is 12 points large only in the first report generated, all later reports have small fonts. Using setDefaultFont instead works correctly.

#include <QtGui>

class MainWindow: public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget * parent = 0)
: QMainWindow(parent), report(0)

{ m_textEdit = new QTextEdit(this); setCentralWidget(m_textEdit); QTimer *timer = new QTimer(this); connect(timer, SIGNAL(timeout()), this, SLOT(generateReport())); timer->start(1000); }

private slots:
void generateReport()

{ static int count = 0; QFont f; f.setPointSize(12); QTextDocument *oldReport = report; report = new QTextDocument(this); // report->setDefaultFont(f); // this always works QTextCursor tc(report); tc.insertText(QString("Hello Qt %1!").arg(++count)); m_textEdit->clear(); m_textEdit->setDocument(report); m_textEdit->setFont(f); // only this doesn't the second time delete oldReport; }

private:
QTextEdit * m_textEdit;
QTextDocument *report;
};

#include "main.moc"

int main(int argc, char * argv[])
{
QApplication app(argc, argv);
MainWindow mainWindow;
mainWindow.show();
return app.exec();
}