The tab order cannot be configured correctly with nested widets

When a widget A is composed of multiple nested widgets, and it is the proxy widget of a widget B, the tab order cannot be changed.

Here is a test case to illustrate the problem:

#include <QtTest/QtTest>
#include <QSpinBox>
#include <QVBoxLayout>
#include <QWidget>

class FriendlyWidget : public QWidget

{ friend class Test; }

;

class Container: public QWidget {
public:
Container(QWidget* parent = 0): QWidget(parent)

{ QVBoxLayout* layout = new QVBoxLayout(this); QSpinBox* spinbox = new QSpinBox(this); layout->addWidget(spinbox); setFocusProxy(spinbox); setFocusPolicy(Qt::TabFocus); }

};

class Test : public QObject{
Q_OBJECT

private slots:
void testTabOrder()

{ FriendlyWidget window; QVBoxLayout* vbox = new QVBoxLayout(&window); Container* container1 = new Container(&window); Container* container3 = new Container(&window); Container* container2 = new Container(&window); Container* container4 = new Container(&window); vbox->addWidget(container1); vbox->addWidget(container2); vbox->addWidget(container3); vbox->addWidget(container4); QWidget::setTabOrder(container1, container2); QWidget::setTabOrder(container2, container3); QWidget::setTabOrder(container3, container4); container1->setFocus(Qt::OtherFocusReason); window.show(); QWidget *widget = QApplication::focusWidget(); QCOMPARE(widget, container1); widget->setFocus(Qt::OtherFocusReason); window.focusNextChild(); widget = QApplication::focusWidget(); QCOMPARE(widget, container2); widget->setFocus(Qt::OtherFocusReason); widget = window.nextInFocusChain(); QCOMPARE(widget, container4); widget->setFocus(Qt::OtherFocusReason); widget = window.nextInFocusChain(); QCOMPARE(widget, container1); window.hide(); }

};

QTEST_MAIN(Test)
#include "test.moc"