Roots search form not showing in sidebar

If I use the search widget in my sidebar, the default is shown (not roots/templates/searchform.php). I should be using the normal search widget right?

The only progress I can make is by commenting out this check in cleanup.php:

function roots_get_search_form($argument) {

  //if ($argument === '') {
    locate_template('/templates/searchform.php', true, false);

Then I get the roots search form AND the WP search form.

What am I missing here?

It doesn’t seem under my control to prevent the caller of get_search_form to not show the default as well as the custom one. I can’t even find any call to get_search_form which passes an argument anyway, unless the following line in general-template.php effects that:

 $result = apply_filters( 'get_search_form', $form );