toHtml does not keep the format

Calling toHtml() on a QTextEdit and set this on a new QTextEdit does not keep the initial format.

#include <QtGui>
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QTextEdit w, w2;
w.show();
a.connect(&a, SIGNAL(lastWindowClosed()), &a, SLOT(quit()));

QTextCursor cursor(w.textCursor());
cursor.movePosition(QTextCursor::Start);

QTextTableFormat tableFormat;
tableFormat.setHeight(150);
QTextTable *table = cursor.insertTable(2, 2, tableFormat);

w2.setHtml(w.toHtml());
w2.show();
return a.exec();
}