addLayout() should reparent the added layout

#include <QtGui>

int main(int argc, char *argv[])
{
   QApplication app(argc, argv);

   QWidget w;
   QHBoxLayout* masterLayout = new QHBoxLayout;
   w.setLayout(masterLayout);

   QGridLayout* gridLayout = new QGridLayout;
   masterLayout->addLayout(gridLayout);
   QHBoxLayout* tmpLayout = new QHBoxLayout;

   tmpLayout->addWidget(new QLabel("Name"));
   tmpLayout->addWidget(new QLineEdit );

   gridLayout->addWidget(new QLabel("spacer"),1, 0);
   gridLayout->addLayout(tmpLayout, 2, 0);

   // does not add the layout as it already has a parent
   // warning note: "QLayout::addChildLayout: layout "" already has a parent"
   masterLayout->addLayout(tmpLayout);

   w.show();
   return app.exec();
}