Fix for subregion with multiple objects (#4424)

Author: lorenzovecchietti

_unittest/test_98_Icepak.py

@@ -131,7 +131,11 @@ def test_03_AssignPCBRegion(self):
             pcb_mesh_region.assignment.padding_types = "Absolute Offset"
             assert pcb_mesh_region.assignment.padding_values == ["2mm"] * 6
             assert pcb_mesh_region.assignment.padding_types == ["Absolute Offset"] * 6
-            subregion = self.aedtapp.modeler.create_subregion([50, 50, 50, 50, 100, 100], "Percentage Offset", "PCB")
+            assert self.aedtapp.modeler.create_subregion([50, 50, 50, 50, 100, 100], "Percentage Offset", "PCB")
+            box = self.aedtapp.modeler.create_box([0, 0, 0], [1, 2, 3])
+            assert self.aedtapp.modeler.create_subregion(
+                [50, 50, 50, 50, 100, 100], "Percentage Offset", ["PCB", box.name]
+            )
         else:
             box = self.aedtapp.modeler.create_box([0, 0, 0], [1, 2, 3])
             pcb_mesh_region.Objects = box.name

pyaedt/modeler/cad/Primitives.py

@@ -6144,9 +6144,7 @@ def _parse_region_args(self, pad_value, pad_type, region_name, parts, region_typ
                 parts = [parts]
             normal_parts = [p for p in parts if p in self._app.modeler.objects_by_name]
             submodel_parts = [p for p in parts if p in self._app.modeler.user_defined_components]
-            normal_parts = ",".join(normal_parts)
-            submodel_parts = ",".join(submodel_parts)
-            arg += [["NAME:SubRegionPartNames", normal_parts], ["NAME:SubRegionSubmodelNames", submodel_parts]]
+            arg += [["NAME:SubRegionPartNames"] + normal_parts, ["NAME:SubRegionSubmodelNames"] + submodel_parts]
             flags = "NonModel#Wireframe"
         arg2 = [
             "NAME:Attributes",