1 files changed, 21 insertions, 3 deletions
diff --git a/tests/auto/qwidget/tst_qwidget.cpp b/tests/auto/qwidget/tst_qwidget.cpp
index 2f221d2..09af941 100644
--- a/tests/auto/qwidget/tst_qwidget.cpp
+++ b/tests/auto/qwidget/tst_qwidget.cpp
@@ -9718,14 +9718,25 @@ void tst_QWidget::destroyBackingStoreWhenHidden()
     child.setAutoFillBackground(true);
     child.setPalette(Qt::blue);
 
+    QWidget grandChild(&child);
+    grandChild.setAutoFillBackground(true);
+    grandChild.setPalette(Qt::yellow);
+
     QVBoxLayout layout(&parent);
     layout.setContentsMargins(10, 10, 10, 10);
     layout.addWidget(&child);
     parent.setLayout(&layout);
 
-    child.winId();
+    QVBoxLayout childLayout(&child);
+    childLayout.setContentsMargins(10, 10, 10, 10);
+    childLayout.addWidget(&grandChild);
+    child.setLayout(&childLayout);
+
+    // Ensure that this widget and all its ancestors are native
+    grandChild.winId();
 
     parent.show();
+
     QTest::qWaitForWindowShown(&parent);
 
     // Check that child window does not obscure parent window
@@ -9734,18 +9745,24 @@ void tst_QWidget::destroyBackingStoreWhenHidden()
     // Native child widget should share parent's backing store
     QVERIFY(0 != backingStore(parent));
     QVERIFY(0 == backingStore(child));
+    QVERIFY(0 == backingStore(grandChild));
 
     // Make child widget full screen
     child.setWindowFlags((child.windowFlags() | Qt::Window) ^ Qt::SubWindow);
     child.setWindowState(child.windowState() | Qt::WindowFullScreen);
     child.show();
+
+    // Paint into the child to ensure that it gets a backing store
+    QPainter painter(&child);
+    painter.fillRect(QRect(0, 0, 90, 90), Qt::white);
+
     QTest::qWaitForWindowShown(&child);
 
     // Ensure that 'window hidden' event is received by parent
     qApp->processEvents();
 
     // Check that child window obscures parent window
-    QVERIFY(parent.visibleRegion().subtracted(child.visibleRegion()).isEmpty());
+    QVERIFY(parent.visibleRegion().subtracted(child.visibleRegion() + grandChild.visibleRegion()).isEmpty());
 
     // Now that extent of child widget goes beyond parent's extent,
     // a new backing store should be created for the child widget.
@@ -9761,11 +9778,12 @@ void tst_QWidget::destroyBackingStoreWhenHidden()
     QTest::qWaitForWindowShown(&child);
 
     // Check that parent is now visible again
-    QVERIFY(!parent.visibleRegion().subtracted(child.visibleRegion()).isEmpty());
+    QVERIFY(!parent.visibleRegion().subtracted(child.visibleRegion() + grandChild.visibleRegion()).isEmpty());
 
     // Native child widget should once again share parent's backing store
     QVERIFY(0 != backingStore(parent));
     QVERIFY(0 == backingStore(child));
+    QVERIFY(0 == backingStore(grandChild));
     }
 
     // 6. Partial reveal followed by full reveal