Account for RootController for dashboard navigation and Dispatch JS

cherry-picked

app/assets/javascripts/dispatcher.js.coffee

@@ -55,7 +55,7 @@ class Dispatcher
       when 'projects:merge_requests:index'
         shortcut_handler = new ShortcutsNavigation()
         MergeRequests.init()
-      when 'dashboard:show'
+      when 'dashboard:show', 'root:show'
         new Dashboard()
         new Activities()
       when 'dashboard:projects:starred'

app/views/layouts/nav/_dashboard.html.haml

 %ul.nav.nav-sidebar
-  = nav_link(path: 'dashboard#show', html_options: {class: 'home'}) do
+  = nav_link(path: ['dashboard#show', 'root#show'], html_options: {class: 'home'}) do
     = link_to dashboard_path, title: 'Home', class: 'shortcuts-activity', data: {placement: 'right'} do
       = icon('dashboard fw')
       %span