FEM: mesh region, on edit hide all meshes and shapes, show the part t…

…o mesh

src/Mod/Fem/_ViewProviderFemMeshRegion.py

@@ -59,6 +59,15 @@ def onChanged(self, vobj, prop):
         return
 
     def setEdit(self, vobj, mode=0):
+        # hide all meshes and shapes, show part to mesh
+        for o in FreeCAD.ActiveDocument.Objects:
+            if o.isDerivedFrom("Fem::FemMeshObject") or hasattr(o, "Shape"):
+                o.ViewObject.hide()
+        if len(self.Object.InList) == 1:
+            self.Object.InList[0].Part.ViewObject.show()
+        else:
+            FreeCAD.Console.PrintError(self.Object.Name + ' seam to belong to more than one mesh object. This is not supported.\n')
+        # show task panel
         import _TaskPanelFemMeshRegion
         taskd = _TaskPanelFemMeshRegion._TaskPanelFemMeshRegion(self.Object)
         taskd.obj = vobj.Object