fix keyboard shortcuts don't work after pressing in some button in the lower view

src/ui/MainWindow.cpp

@@ -1,5 +1,6 @@
 #include "MainWindow.h"
 
+#include <QApplication>
 #include <QHBoxLayout>
 #include <QMessageBox>
 #include <QPushButton>
@@ -76,6 +77,13 @@ MainWindow::MainWindow(Simulation* sim, const GameConfig* config,
             m_gameWorldView, SLOT(setGameSpeed(double)));
 
     m_gameWorldView->setFocus();
+
+    connect(qApp, &QApplication::focusChanged, this, [this](QWidget*, QWidget* newWidget) {
+        if (newWidget && newWidget != m_gameWorldView && !QApplication::activeModalWidget())
+        {
+            m_gameWorldView->setFocus();
+        }
+    });
 }
 
 void MainWindow::resizeEvent(QResizeEvent* event)