Fix crash in QApplication auto test

The pointer is lazily initialised by QWidget, but becomes invalid after
the application is destroyed.
In the QApplication autotest, QApplication is created and destroyed many times
in the same thread (while in normal use it is created at startup and destroyed
on exit)
As a result, the pointer which is stored in global data became stale and
caused a crash due to calling functions on a deleted object.

Reviewed-By: Jason Barron

1 files changed, 3 insertions, 0 deletions

diff --git a/src/gui/kernel/qapplication_s60.cpp b/src/gui/kernel/qapplication_s60.cpp
index ad44d21..57702c6 100644
--- a/src/gui/kernel/qapplication_s60.cpp
+++ b/src/gui/kernel/qapplication_s60.cpp
@@ -1613,6 +1613,9 @@ extern void qt_cleanup_symbianFontDatabaseExtras(); // qfontdatabase_s60.cpp
  *****************************************************************************/
 void qt_cleanup()
 {
+#ifdef Q_WS_S60
+    S60->setButtonGroupContainer(0);
+#endif
     if(qt_S60Beep) {
         delete qt_S60Beep;
         qt_S60Beep = 0;