Fix spurious quitting when dialog closed and in tray

src/main.cpp

@@ -177,6 +177,7 @@ int main(int argc, char *argv[])
     }
 
     // Run
+    a.setQuitOnLastWindowClosed(false);
     Widget* w = Widget::getInstance();
     int errorcode = a.exec();
 

src/widget/widget.cpp

@@ -360,6 +360,7 @@ void Widget::closeEvent(QCloseEvent *event)
     {
         saveWindowGeometry();
         saveSplitterGeometry();
+        qApp->exit(0);
         QWidget::closeEvent(event);
     }
 }