CtfVisualizer: Destroy CtfTool earlier again

Amends 796053d7.

After all, the defaulted destructor of the class did some actual work
via the destructors of the QScopedPointer members.

Change-Id: If6dc8a3d57961ec263fced11f9fa9f7e9f8c54cc
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/plugins/ctfvisualizer/ctfvisualizerplugin.cpp

@@ -14,7 +14,7 @@ class CtfVisualizerPlugin : public ExtensionSystem::IPlugin
 
     void initialize() final
     {
-        setupCtfVisualizerTool();
+        setupCtfVisualizerTool(this);
     }
 };
 

src/plugins/ctfvisualizer/ctfvisualizertool.cpp

@@ -35,8 +35,9 @@ namespace CtfVisualizer::Internal {
 
 using json = nlohmann::json;
 
-CtfVisualizerTool::CtfVisualizerTool()
+CtfVisualizerTool::CtfVisualizerTool(QObject *parent)
-    : m_modelAggregator(new Timeline::TimelineModelAggregator(this))
+    : QObject(parent)
+    , m_modelAggregator(new Timeline::TimelineModelAggregator(this))
     , m_zoomControl(new Timeline::TimelineZoomControl(this))
     , m_statisticsModel(new CtfStatisticsModel(this))
     , m_traceManager(new CtfTraceManager(this, m_modelAggregator.get(), m_statisticsModel.get()))
@@ -251,9 +252,9 @@ void CtfVisualizerTool::loadJson(const QString &fileName)
     m_loader->start();
 }
 
-void setupCtfVisualizerTool()
+void setupCtfVisualizerTool(QObject *guard)
 {
-    static CtfVisualizerTool theCtfVisualizerTool;
+    (void) new CtfVisualizerTool(guard);
 }
 
 }  // namespace CtfVisualizer::Internal

src/plugins/ctfvisualizer/ctfvisualizertool.h

@@ -28,7 +28,7 @@ class CtfVisualizerTool  : public QObject
     Q_OBJECT
 
 public:
-    CtfVisualizerTool();
+    explicit CtfVisualizerTool(QObject *parent);
     ~CtfVisualizerTool();
 
     Timeline::TimelineModelAggregator *modelAggregator() const;
@@ -66,6 +66,6 @@ private:
     QMenu *const m_restrictToThreadsMenu;
 };
 
-void setupCtfVisualizerTool();
+void setupCtfVisualizerTool(QObject *guard);
 
 } // namespace CtfVisualizer::Internal