Fixed non closing of SPIERSview application on macOS when file is not…

… dirty

This fixes the issue where the SPIERSview application stays open in macOS after pressing the 'Red Cross' but were the GUI is removed. This needs testing on Windows to see if it is going to cause problems... if so some IF definition staments can be added to make it macOS only.

SPIERSview/src/mainwindow.cpp

@@ -2811,6 +2811,7 @@ void MainWindow::closeEvent(QCloseEvent *event)
     if (isVaxmlMode == true)
     {
         event->accept();
+        QCoreApplication::quit();
         return;
     }
 
@@ -2823,7 +2824,11 @@ void MainWindow::closeEvent(QCloseEvent *event)
         msgBox.setStandardButtons(QMessageBox::Yes | QMessageBox::Cancel);
         msgBox.setDefaultButton(QMessageBox::Cancel);
         int ret = msgBox.exec();
-        if (ret == QMessageBox::Yes) QCoreApplication::quit();
+
+        if (ret == QMessageBox::Yes) {
+            QCoreApplication::quit();
+        }
+
         event->ignore();
         return;
     }
@@ -2842,13 +2847,20 @@ void MainWindow::closeEvent(QCloseEvent *event)
             event->accept();
             QCoreApplication::quit();
         }
-        else if (ret == QMessageBox::Cancel) event->ignore();
+        else if (ret == QMessageBox::Cancel) {
+            event->ignore();
+            return;
+        }
         else if (ret == QMessageBox::Discard)
         {
             event->accept();
             QCoreApplication::quit();
         }
     }
+
+    // If this has not been caught above then let close the application
+    event->accept();
+    QCoreApplication::quit();
 }
 
 /**