FEM: mesh result object, make it child of mechanical result

src/Mod/Fem/FemTools.py

@@ -66,8 +66,11 @@ class FemTools(QtCore.QRunnable, QtCore.QObject):
     def purge_results(self):
         for m in self.analysis.Member:
             if (m.isDerivedFrom('Fem::FemResultObject')):
+                if m.Mesh and hasattr(m.Mesh, "Proxy") and m.Mesh.Proxy.Type == "FemMeshResult":
+                    self.analysis.Document.removeObject(m.Mesh.Name)
                 self.analysis.Document.removeObject(m.Name)
         self.results_present = False
+        FreeCAD.ActiveDocument.recompute()
 
     ## Resets mesh deformation
     #  @param self The python object self

src/Mod/Fem/PyGui/_ViewProviderFemResultMechanical.py

@@ -70,7 +70,8 @@ class _ViewProviderFemResultMechanical:
             if hasattr(self.Object, "Mesh") and self.Object.Mesh:
                 mem = FemGui.getActiveAnalysis().Member
                 if self.Object in mem:
-                    if self.Object.Mesh in mem:
+                    # if self.Object.Mesh in mem:
+                    if True:
                         hide_femmeshes_postpiplines()
                         # only show the FEM mesh we would like to view results with
                         self.Object.Mesh.ViewObject.show()
@@ -111,6 +112,17 @@ class _ViewProviderFemResultMechanical:
     def __setstate__(self, state):
         return None
 
+    def claimChildren(self):
+        return [self.Object.Mesh]  # claimChildren needs to return a list !
+
+    def onDelete(self, feature, subelements):
+        try:
+            for obj in self.claimChildren():
+                obj.ViewObject.show()
+        except Exception as err:
+            FreeCAD.Console.PrintError("Error in onDelete: " + err.message)
+        return True
+
 
 # helper
 def hide_femmeshes_postpiplines():