launcher: fix rare use after free bug

src/launcher/include/configurationItem.h

@@ -3,6 +3,7 @@
 
 #include "common.h"
 
+#include <QObject>
 #include <QTreeWidgetItem>
 
 #include <memory>
@@ -14,7 +15,7 @@ class QTreeWidget;
 class QWidget;
 
 class Configuration;
-class ConfigurationItem: public QTreeWidgetItem {
+class ConfigurationItem: public QObject, public QTreeWidgetItem {
 public:
 	explicit ConfigurationItem(std::unique_ptr<Configuration> info, QTreeWidget* parent);
 	~ConfigurationItem() override;

src/launcher/src/mainDialog.cpp

@@ -15,6 +15,7 @@
 #include <QIODevice>
 #include <QLabel>
 #include <QMessageBox>
+#include <QPointer>
 #include <QProcess>
 #include <QRadioButton>
 #include <QRegularExpression>
@@ -95,7 +96,7 @@ private:
 
 	/*DetachableProcess*/ QProcess m_process;
 
-	ConfigurationItem* m_running_item = nullptr;
+	QPointer<ConfigurationItem> m_running_item;
 };
 
 QByteArray MainDialogPrivate::g_last_geometry;