Copy and paste -> Clipboard refactored to accept more than one object

src/slic3r/GUI/GUI_ObjectList.cpp

@@ -2167,6 +2167,7 @@ void ObjectList::update_selections_on_canvas()
         add_to_selection(item, selection, instance_idx, false);
 
     wxGetApp().plater()->canvas3D()->update_gizmos_on_off_state();
+    wxGetApp().plater()->canvas3D()->render();
 }
 
 void ObjectList::select_item(const wxDataViewItem& item)