Add filtered search to group merge requests dashboard

app/assets/javascripts/dispatcher.js

@@ -184,13 +184,13 @@ import initChangesDropdown from './init_changes_dropdown';
           break;
         case 'dashboard:issues':
         case 'dashboard:merge_requests':
-        case 'groups:merge_requests':
           new ProjectSelect();
           initLegacyFilters();
           break;
         case 'groups:issues':
+        case 'groups:merge_requests':
           if (filteredSearchEnabled) {
-            const filteredSearchManager = new gl.FilteredSearchManager('issues');
+            const filteredSearchManager = new gl.FilteredSearchManager(page === 'groups:issues' ? 'issues' : 'merge_requests');
             filteredSearchManager.setup();
           }
           new ProjectSelect();

app/views/groups/merge_requests.html.haml

 - page_title "Merge Requests"
+- content_for :page_specific_javascripts do
+  = webpack_bundle_tag 'common_vue'
+  = webpack_bundle_tag 'filtered_search'
+
 - if show_new_nav? && current_user
   - content_for :breadcrumbs_extra do
     = render 'shared/new_project_item_select', path: 'merge_requests/new', label: "New merge request"
@@ -13,7 +17,7 @@
       .nav-controls{ class: ("visible-xs" if show_new_nav?) }
         = render 'shared/new_project_item_select', path: 'merge_requests/new', label: "New merge request"
-  = render 'shared/issuable/filter', type: :merge_requests
+  = render 'shared/issuable/search_bar', type: :merge_requests
   .row-content-block.second-block
     Only merge requests from