Try a longer timer to see if widgets got painted

Libs/Widgets/Testing/Cpp/ctkCheckableHeaderViewTest1.cpp

@@ -251,7 +251,7 @@ int ctkCheckableHeaderViewTest1(int argc, char * argv [] )
 
   if (argc < 2 || QString(argv[1]) != "-I" )
     {
-    QTimer::singleShot(200, &app, SLOT(quit()));
+    QTimer::singleShot(500, &app, SLOT(quit()));
     }
   
   return app.exec();