am f1435b73: remove the dummy sidenav from samples before populating the real list. Also make the line numbers hidden before they get moved to avoid some jankyness during load.

* commit 'f1435b73bd373cad0bcd06f38f458f8706e07162':
  remove the dummy sidenav from samples before populating the real list. Also make the line numbers hidden before they get moved to avoid some jankyness during load.