Fix monitor fullscreen in some cases and don't lose focus (broke shortcuts)

src/monitor/monitor.cpp

@@ -776,10 +776,11 @@ void Monitor::slotSwitchFullScreen(bool minimizeOnly)
         // Move monitor widget to the second screen (one screen for Kdenlive, the other one for the Monitor widget)
         if (qApp->screens().count() > 1) {
             for (auto screen : qApp->screens()) {
-                if (screen != qApp->screenAt(pCore->window()->geometry().center())) {
-                    QRect rect = screen->availableGeometry();
+                QRect screenRect = screen->availableGeometry();
+                if (!screenRect.contains(pCore->window()->geometry().center())) {
                     m_glWidget->setParent(nullptr);
-                    m_glWidget->move(this->parentWidget()->mapFromGlobal(rect.center()));
+                    m_glWidget->move(this->parentWidget()->mapFromGlobal(screenRect.center()));
+                    m_glWidget->setGeometry(screenRect);
                     break;
                 }
             }
@@ -787,6 +788,7 @@ void Monitor::slotSwitchFullScreen(bool minimizeOnly)
             m_glWidget->setParent(nullptr);
         }
         m_glWidget->showFullScreen();
+        qApp->activeWindow()->setFocus();
     } else {
         m_glWidget->showNormal();
         auto *lay = (QVBoxLayout *)layout();