Column width being reset unexpected in QTableView

// code placeholder

#include <QApplication>
 #include <QTableView>
 #include <QStandardItem>
 #include <QStandardItemModel>
int main(int argc, char *argv[])
 {
 QApplication a(argc, argv);
 QTableView view;
 QStandardItemModel model;
 model.setHorizontalHeaderItem(0, new QStandardItem(QObject::tr("Column 1")));
 model.setHorizontalHeaderItem(1, new QStandardItem(QObject::tr("Column 2")));
 model.setItem(0, 0, new QStandardItem("a"));
 model.setItem(0, 1, new QStandardItem("b"));
 view.setModel(&model);
 view.setSortingEnabled(true);
 view.show();
return a.exec();
 }