Crash in QWidgetPrivate::init on QApplication::quit() using a modal dialog on Mac

The problem was the order of deletion in the destructor. To autotest
this I create an application, start a modal dialog and then quit the
application.
The fix was contributed by a customer.

Task-number: QTBUG-12673
Reviewed-by: Olivier Goffart

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/auto/qapplication/modal/base.cpp b/tests/auto/qapplication/modal/base.cpp
new file mode 100644
index 0000000..d3a7de6
--- /dev/null
+++ b/tests/auto/qapplication/modal/base.cpp
@@ -0,0 +1,21 @@
+#include "base.h"
+
+base::base(QWidget *parent) :
+    QWidget(parent)
+{
+    m_timer = new QTimer(this);
+    m_modalStarted = false;
+    m_timer->setSingleShot(false);
+    connect(m_timer, SIGNAL(timeout()), this, SLOT(periodicTimer()));
+    m_timer->start(5000);
+}
+
+void base::periodicTimer()
+{
+    if(m_modalStarted)
+        exit(0);
+    m_modalDialog = new QDialog(this);
+    m_modalDialog->setModal(true);
+    m_modalDialog->show();
+    m_modalStarted = true;
+}