Make sure the parent widget still exists.

It may happen that InPlaceWidgetHelper's destructor
is called after parent widget destructor. Now inside
InPlaceWidgetHelper's destructor we check if parent
widget still exists.

Task-number: QTCREATORBUG-7684
Change-Id: I4c9ecbfae7323fd95345ccabc113218a7011ebe8
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
(cherry picked from commit aad795575646b37b5c531cb6314eaa049e90e076)

2 files changed, 4 insertions, 2 deletions

diff --git a/tools/designer/src/components/taskmenu/inplace_widget_helper.cpp b/tools/designer/src/components/taskmenu/inplace_widget_helper.cpp
index fc34b98..d71d265 100644
--- a/tools/designer/src/components/taskmenu/inplace_widget_helper.cpp
+++ b/tools/designer/src/components/taskmenu/inplace_widget_helper.cpp
@@ -65,7 +65,8 @@ namespace qdesigner_internal {
 
     InPlaceWidgetHelper::~InPlaceWidgetHelper()
     {
-        m_parentWidget->setAttribute(Qt::WA_NoChildEventsForParent, m_noChildEvent);
+        if (m_parentWidget)
+            m_parentWidget->setAttribute(Qt::WA_NoChildEventsForParent, m_noChildEvent);
     }
 
     Qt::Alignment InPlaceWidgetHelper::alignment() const {
diff --git a/tools/designer/src/components/taskmenu/inplace_widget_helper.h b/tools/designer/src/components/taskmenu/inplace_widget_helper.h
index de13a23..972b5a7 100644
--- a/tools/designer/src/components/taskmenu/inplace_widget_helper.h
+++ b/tools/designer/src/components/taskmenu/inplace_widget_helper.h
@@ -46,6 +46,7 @@
 #include <QtCore/QObject>
 #include <QtCore/QPoint>
 #include <QtCore/QSize>
+#include <QtCore/QPointer>
 #include <qglobal.h>
 
 QT_BEGIN_NAMESPACE
@@ -75,7 +76,7 @@ namespace qdesigner_internal {
         Qt::Alignment alignment() const;
     private:
         QWidget *m_editorWidget;
-        QWidget *m_parentWidget;
+        QPointer<QWidget> m_parentWidget;
         const bool m_noChildEvent;
         QPoint m_posOffset;
         QSize m_sizeOffset;