[FEM] handle Elmer result mesh zoom properly

- also fix an issue that after a successful simulation, no result was visible

src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp

@@ -428,13 +428,6 @@ void ViewProviderFemPostObject::WritePointData(vtkPoints* points, vtkDataArray*
     if (!points)
         return;
 
-    // if the object contains "Elmer" but no scale has been set, we set it to 1000.0
-    // because for Elmer we work with SI units and thus get a scaled result we need to transform
-    auto Label = std::string(pcObject->Label.getValue());
-    auto found = Label.find(std::string("Elmer"));
-    if (found != std::string::npos && strcmp(Scale.getValueAsString(), "1000") != 0)
-        Scale.setValue("1000");
-
     // we must inherit the Scale of parent meshes (for example for clip filters)
     auto parents = pcObject->getInList();
     if (parents.size()) {

src/Mod/Fem/femsolver/elmer/tasks.py

@@ -169,6 +169,10 @@ class Results(run.Results):
             "Fem::FemPostPipeline", self.solver.Name + "Result")
         self.solver.ElmerResult.Label = self.solver.Label + "Result"
         self.analysis.addObject(self.solver.ElmerResult)
+        # set the scale to 1 (meaning factor 1000) to scale the mesh back for display
+        self.solver.ElmerResult.ViewObject.Scale = 1
+        # to assure the user sees something, set the default to Surface
+        self.solver.ElmerResult.ViewObject.DisplayMode = "Surface"
 
     def _getResultFile(self):
         postPath = None