Call QWidget close handling in QWidget::close for non-toplevel native widgets

Since commit 7ba75d0 we close the QWindow in QWidget::close for native
widgets and trigger the closeEvent in QWidgetWindow. However, if the
widget's window handle is not a top level window, QWindow::close()
will not close the window, failing in this way to deliver the
closeEvent and call the close handling in QWidgetPrivate::handleClose.
To fix, call handleClose() from QWidget::close for such widgets.

Task-number: QTBUG-74606
Pick-to: 6.2
Change-Id: Ied342eced3340aaf19b5443762935b1a5fc5c27b
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

3 files changed, 25 insertions, 3 deletions

diff --git a/src/gui/kernel/qwindow.cpp b/src/gui/kernel/qwindow.cpp
index 590c56eab8..61756a3834 100644
--- a/src/gui/kernel/qwindow.cpp
+++ b/src/gui/kernel/qwindow.cpp
@@ -2258,7 +2258,7 @@ bool QWindow::close()
     Q_D(QWindow);
 
     // Do not close non top level windows
-    if (parent())
+    if (!isTopLevel())
         return false;
 
     if (!d->platformWindow)
diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index 5c42a5da23..2534a7aeba 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -8466,8 +8466,10 @@ bool QWidgetPrivate::close()
     // Close native widgets via QWindow::close() in order to run QWindow
     // close code. The QWidget-specific close code in handleClose() will
     // in this case be called from the Close event handler in QWidgetWindow.
-    if (QWindow *widgetWindow = windowHandle())
-        return widgetWindow->close();
+    if (QWindow *widgetWindow = windowHandle()) {
+        if (widgetWindow->isTopLevel())
+            return widgetWindow->close();
+    }
 
     return handleClose(QWidgetPrivate::CloseWithEvent);
 }
diff --git a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
index a7c3f86687..00350c3946 100644
--- a/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
+++ b/tests/auto/widgets/kernel/qwidget/tst_qwidget.cpp
@@ -243,6 +243,7 @@ private slots:
     void winIdChangeEvent();
     void persistentWinId();
     void showNativeChild();
+    void closeAndShowNativeChild();
     void closeAndShowWithNativeChild();
     void transientParent();
     void qobject_castInDestroyedSlot();
@@ -4776,6 +4777,25 @@ void tst_QWidget::showNativeChild()
     QVERIFY(QTest::qWaitForWindowExposed(&topLevel));
 }
 
+void tst_QWidget::closeAndShowNativeChild()
+{
+    QWidget topLevel;
+    QWidget *nativeChild = new QWidget;
+    nativeChild->winId();
+    nativeChild->setFixedSize(200, 200);
+
+    QHBoxLayout *layout = new QHBoxLayout;
+    layout->addWidget(nativeChild);
+    topLevel.setLayout(layout);
+
+    topLevel.show();
+    QVERIFY(!nativeChild->isHidden());
+    nativeChild->close();
+    QVERIFY(nativeChild->isHidden());
+    nativeChild->show();
+    QVERIFY(!nativeChild->isHidden());
+}
+
 void tst_QWidget::closeAndShowWithNativeChild()
 {
     bool dontCreateNativeWidgetSiblings = QApplication::testAttribute(Qt::AA_DontCreateNativeWidgetSiblings);