PerfProfiler: Fix memory leak

If the tool view is never shown, the respective widgets have no owner
and need to be deleted manually.

Change-Id: I6db7113d864607ae233f792363f13cfe841ccd10
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

src/plugins/perfprofiler/perfprofilertool.cpp

@@ -138,6 +138,7 @@ PerfProfilerTool::PerfProfilerTool()
 
     m_tracePointsButton = new QToolButton;
     m_tracePointsButton->setDefaultAction(tracePointsAction);
+    m_objectsToDelete << m_tracePointsButton;
 
     auto action = new QAction(tr("Performance Analyzer"), this);
     action->setToolTip(tr("Finds performance bottlenecks."));
@@ -150,6 +151,7 @@ PerfProfilerTool::PerfProfilerTool()
 
     m_startAction = Debugger::createStartAction();
     m_stopAction = Debugger::createStopAction();
+    m_objectsToDelete << m_startAction << m_stopAction;
 
     QObject::connect(m_startAction, &QAction::triggered, action, &QAction::triggered);
     QObject::connect(m_startAction, &QAction::changed, action, [action, tracePointsAction, this] {
@@ -169,13 +171,21 @@ PerfProfilerTool::PerfProfilerTool()
     m_recordedLabel->setProperty("panelwidget", true);
     m_delayLabel = new QLabel;
     m_delayLabel->setProperty("panelwidget", true);
+    m_objectsToDelete << m_recordButton << m_clearButton << m_filterButton << m_aggregateButton
+                      << m_recordedLabel << m_delayLabel;
 
     m_perspective.setAboutToActivateCallback([this]() { createViews(); });
     updateRunActions();
 }
 
+PerfProfilerTool::~PerfProfilerTool()
+{
+    qDeleteAll(m_objectsToDelete);
+}
+
 void PerfProfilerTool::createViews()
 {
+    m_objectsToDelete.clear();
     m_traceView = new PerfProfilerTraceView(nullptr, this);
     m_traceView->setWindowTitle(tr("Timeline"));
     connect(m_traceView, &PerfProfilerTraceView::gotoSourceLocation,

src/plugins/perfprofiler/perfprofilertool.h

@@ -49,6 +49,8 @@ class PerfProfilerTool  : public QObject
     Q_OBJECT
 public:
     PerfProfilerTool();
+    ~PerfProfilerTool();
+
     static PerfProfilerTool *instance();
 
     PerfProfilerTraceManager *traceManager() const;
@@ -115,6 +117,7 @@ private:
     QMenu *m_filterMenu = nullptr;
     QToolButton *m_aggregateButton = nullptr;
     QToolButton *m_tracePointsButton = nullptr;
+    QList<QObject *> m_objectsToDelete;
 
     PerfProfilerTraceView *m_traceView = nullptr;
     PerfProfilerStatisticsView *m_statisticsView = nullptr;