Cabana: confirm exit without saving (#26452)

* confirm exit without saving

* typo

tools/cabana/mainwin.cc

@@ -227,6 +227,16 @@ void MainWindow::dockCharts(bool dock) {
 }
 
 void MainWindow::closeEvent(QCloseEvent *event) {
+  if (detail_widget->undo_stack->index() > 0) {
+    auto ret = QMessageBox::question(this, tr("Unsaved Changes"),
+                                     tr("Are you sure you want to exit without saving?\nAny unsaved changes will be lost."),
+                                     QMessageBox::Yes | QMessageBox::No);
+    if (ret == QMessageBox::No) {
+      event->ignore();
+      return;
+    }
+  }
+
   main_win = nullptr;
   if (floating_window)
     floating_window->deleteLater();