Cleaner deletion order on exit

src/mainwindow.cpp

@@ -719,7 +719,7 @@ void MainWindow::updateAction()
 MainWindow::~MainWindow()
 {
     pCore->prepareShutdown();
-    m_timelineTabs->disconnectTimeline(getMainTimeline());
+    delete m_timelineTabs;
     delete m_audioSpectrum;
     if (m_projectMonitor) {
         m_projectMonitor->stop();

src/timeline2/view/timelinewidget.cpp

@@ -91,8 +91,6 @@ TimelineWidget::TimelineWidget(QWidget *parent)
 
 TimelineWidget::~TimelineWidget()
 {
-    rootContext()->setContextProperty("multitrack", 0);
-    rootContext()->setContextProperty("timeline", 0);
     delete m_proxy;
 }