Updates the dropdown to match the docs and remove old hack of stop event propagation

app/views/layouts/_search.html.haml

@@ -13,7 +13,8 @@
         .location-badge= label
       .search-input-wrap
         .dropdown{ data: { url: search_autocomplete_path } }
-          = search_field_tag 'search', nil, placeholder: 'Search', class: 'search-input dropdown-menu-toggle no-outline js-search-dashboard-options', spellcheck: false, tabindex: '1', autocomplete: 'off', data: { toggle: 'dropdown', issues_path: issues_dashboard_url, mr_path: merge_requests_dashboard_url }, aria: { label: 'Search' }
+          = search_field_tag 'search', nil, placeholder: 'Search', class: 'search-input dropdown-menu-toggle no-outline js-search-dashboard-options', spellcheck: false, tabindex: '1', autocomplete: 'off', data: { issues_path: issues_dashboard_url, mr_path: merge_requests_dashboard_url }, aria: { label: 'Search' }
+          %button.hidden.js-dropdown-search-toggle{ data: { toggle: 'dropdown' }}
           .dropdown-menu.dropdown-select
             = dropdown_content do
               %ul

spec/javascripts/search_autocomplete_spec.js

@@ -191,8 +191,6 @@ import '~/lib/utils/common_utils';
       // browsers will not trigger default behavior (form submit, in this
       // example) on JavaScript-created keypresses.
       expect(submitSpy).not.toHaveBeenTriggered();
-      // Does a worse job at capturing the intent of the test, but works.
-      expect(enterKeyEvent.isDefaultPrevented()).toBe(true);
     });
   });
 }).call(window);