Adjust navigation layout on main feed pages

app/views/layouts/feed.haml

@@ -1,9 +1,9 @@
-= render 'navigation/feed'
 .container.container--main
   .row
     .col-md-3.col-sm-4.d-none.d-sm-block
       = render 'shared/sidebar'
     .col-md-9.col-xs-12.col-sm-8
       = render 'layouts/messages'
+      = render 'tabs/feed'
       = yield
   .d-block.d-sm-none= render 'shared/links'

app/views/shared/_sidebar.haml

@@ -8,18 +8,12 @@
           = current_user.display_name
       .profile__screen-name
         = current_user.screen_name
-.card
-  .list-group
-    = list_group_item t('views.general.timeline'), root_path
-    - if APP_CONFIG.dig(:features, :public, :enabled)
-      = list_group_item t('views.general.public'), public_timeline_path
-    - current_user.groups.each do |group|
-      = list_group_item group.display_name, group_timeline_path(group.name)
 - unless @group.nil?
-  .card.profile--panel
-    .card-header
-      %h3.card-title= t('views.group.members')
+  .card
+    .card-header= t('views.group.members')
     .card-body
+      - if @group.members.empty?
+        %p.text-muted No members yet!
       - @group.members.each do |member|
         %a{href: show_user_profile_path(member.user.screen_name), title: member.user.screen_name, data: { toggle: :tooltip, placement: :top }}
           %img.avatar-xs{src: member.user.profile_picture.url(:medium)}

app/views/tabs/_feed.haml

@@ -0,0 +1,25 @@
+.card
+  .list-group.list-group-horizontal-sm.text-center
+    = list_group_item t('views.general.timeline'), root_path
+    - if APP_CONFIG.dig(:features, :public, :enabled)
+      = list_group_item t('views.general.public'), public_timeline_path
+    .list-group-item.list-group-item-action.dropdown{class: "#{'active' if @group}"}
+      %a.dropdown-toggle{ type: 'button', data: { toggle: 'dropdown' }, aria: { haspopup: true, expanded: false }}
+        - if @group
+          = @group.display_name
+        - else
+          Groups
+      .dropdown-menu
+        - if current_user.groups.empty?
+          .p-3
+            %p Looks like you don't have any groups yet!
+            %p
+              You can create groups and add users to them using the
+              %i.fa.fa-fw.fa-users
+              icon in the navigation on user profiles (that are not yours)
+            %p.mb-0
+              Once you have done that, the groups will be listed here and
+              if selected, you'll get a timeline view of all users from
+              that group!
+        - current_user.groups.each do |group|
+          %a.dropdown-item{ href: group_timeline_path(group.name) }= group.display_name