PartDesign: do not touch body on child change

src/Mod/PartDesign/App/Body.cpp

@@ -56,6 +56,7 @@ using namespace PartDesign;
 PROPERTY_SOURCE(PartDesign::Body, Part::BodyBase)
 
 Body::Body() {
+    _GroupTouched.setStatus(App::Property::Output,true);
 }
 
 /*
@@ -532,5 +533,6 @@ void Body::onDocumentRestored()
         if(obj->isDerivedFrom(PartDesign::Feature::getClassTypeId()))
             static_cast<PartDesign::Feature*>(obj)->_Body.setValue(this);
     }
+    _GroupTouched.setStatus(App::Property::Output,true);
     DocumentObject::onDocumentRestored();
 }