[PartDesign] Improve Helix calculation for straight shape (#7674)

src/Mod/PartDesign/App/FeatureHelix.cpp

@@ -241,8 +241,11 @@ App::DocumentObjectExecReturn* Helix::execute()
             mkPS.SetTolerance(Precision::Confusion());
             mkPS.SetTransitionMode(BRepBuilderAPI_Transformed);
 
-            //mkPS.SetMode(true);  //This is for frenet
-            mkPS.SetMode(TopoDS::Wire(auxpath), true);  // this is for auxiliary
+            if (Angle.getValue() == 0) {
+                mkPS.SetMode(true);  //This is for frenet
+            } else {
+                mkPS.SetMode(TopoDS::Wire(auxpath), true);  // this is for auxiliary
+            }
 
             for (TopoDS_Wire& wire : wires) {
                 wire.Move(invObjLoc);