Fix clip monitor not pausing at clip end, fix play zone activating wrong monitor

src/core.cpp

@@ -52,6 +52,7 @@ Core::Core()
 void Core::prepareShutdown()
 {
     m_guiConstructed = false;
+    m_mainWindow->getCurrentTimeline()->controller()->prepareClose();
     projectItemModel()->blockSignals(true);
     QThreadPool::globalInstance()->clear();
 }

src/monitor/glwidget.cpp

@@ -701,7 +701,7 @@ bool GLWidget::checkFrameNumber(int pos, int offset, bool isPlaying)
         return true;
     } else if (isPlaying) {
         maxPos -= offset;
-        if (pos >= (maxPos - 1) && speed > 0.) {
+        if (pos >= (maxPos - 1) && !(speed < 0.)) {
             // Playing past last clip, pause
             m_producer->set_speed(0);
             m_consumer->set("refresh", 0);

src/monitor/monitor.cpp

@@ -266,6 +266,9 @@ Monitor::Monitor(Kdenlive::MonitorId id, MonitorManager *manager, QWidget *paren
 
     auto *playButton = new QToolButton(m_toolbar);
     m_playMenu = new QMenu(i18n("Play..."), this);
+    connect(m_playMenu, &QMenu::aboutToShow, [this]() {
+        slotActivateMonitor();
+    });
     QAction *originalPlayAction = static_cast<KDualAction *>(manager->getAction(QStringLiteral("monitor_play")));
     m_playAction = new KDualAction(i18n("Play"), i18n("Pause"), this);
     m_playAction->setInactiveIcon(QIcon::fromTheme(QStringLiteral("media-playback-start")));