Added qwidget test case which displays a native child widget

As of commit bc82db, show()ing a native child widget causes a panic
on Symbian.  The panic code (WSERV-10) indicates that Activate() is
being called on an already-active graphics context.

This test case reproduces the defect.

Task-number: QTBUG-7960

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/auto/qwidget/tst_qwidget.cpp b/tests/auto/qwidget/tst_qwidget.cpp
index 03eddee..b59017b 100644
--- a/tests/auto/qwidget/tst_qwidget.cpp
+++ b/tests/auto/qwidget/tst_qwidget.cpp
@@ -250,6 +250,7 @@ private slots:
 #else
     void persistentWinId();
 #endif
+    void showNativeChild();
     void qobject_castInDestroyedSlot();
 
     void showHideEvent_data();
@@ -4586,6 +4587,16 @@ void tst_QWidget::persistentWinId()
 }
 #endif // Q_OS_SYMBIAN
 
+void tst_QWidget::showNativeChild()
+{
+    QWidget topLevel;
+    topLevel.setGeometry(0, 0, 100, 100);
+    QWidget child(&topLevel);
+    child.winId();
+    topLevel.show();
+    QTest::qWaitForWindowShown(&topLevel);
+}
+
 class ShowHideEventWidget : public QWidget
 {
 public: