mainwindow: use app name and version in window title

app/window/mainwindow/mainwindow.cpp

@@ -94,6 +94,8 @@ MainWindow::MainWindow(QWidget *parent) :
   viewer_panel_->ConnectTimeBasedPanel(timeline_panel_);
   viewer_panel_->ConnectTimeBasedPanel(param_panel_);
   viewer_panel_->ConnectTimeBasedPanel(curve_panel_);
+
+  UpdateTitle();
 }
 
 void MainWindow::SetFullscreen(bool fullscreen)
@@ -160,6 +162,13 @@ void MainWindow::closeEvent(QCloseEvent *e)
   QMainWindow::closeEvent(e);
 }
 
+void MainWindow::UpdateTitle()
+{
+  setWindowTitle(QStringLiteral("%1 %2 - %3").arg(QApplication::applicationName(),
+                                                  QApplication::applicationVersion(),
+                                                  tr("<untitled>")));
+}
+
 void MainWindow::SetDefaultLayout()
 {
   task_man_panel_->close();

app/window/mainwindow/mainwindow.h

@@ -55,6 +55,8 @@ protected:
   virtual void closeEvent(QCloseEvent* e) override;
 
 private:
+  void UpdateTitle();
+
   QByteArray premaximized_state_;
 
   // Standard panels