[jw2] improve report from GUI/Check ()

Merging branch 'jw2'  into 'r22'.

See merge request !1852

Tests/Suite/GUI/Check.cpp

@@ -49,15 +49,15 @@ std::unique_ptr<ISimulation> indirectSimulation(const ISimulation& sim)
 
 bool checkSimulation(const std::string& name, ISimulation& sim, const double limit)
 {
-    std::cout << "Tests/Suite/GUI:"
-              << " Validate round trip (simulation -> GUI items -> simulation)"
-              << " against direct simulation." << std::endl;
+    std::cout << "Tests/Suite/GUI: " << name << std::endl;
+    std::cout << "  Direct simulation" << std::endl;
+    const Datafield ref_data = sim.simulate();
 
+    std::cout << "  Round trip (simulation -> GUI items -> simulation)" << std::endl;
     std::unique_ptr<ISimulation> sim2(indirectSimulation(sim));
-
     const Datafield data2 = sim2->simulate();
-    const Datafield ref_data = sim.simulate();
 
+    std::cout << "  Check difference" << std::endl;
     bool ok = DiffUtil::checkRelativeDifference(data2.flatVector(), ref_data.flatVector(), limit);
 
     if (ok)