Extra links in label filter dropdown fotoer

app/assets/stylesheets/framework/dropdowns.scss

@@ -301,6 +301,14 @@
   border-top: 1px solid $dropdown-divider-color;
 }
 
+.dropdown-footer-list {
+  font-size: 14px;
+
+  a {
+    padding-left: 10px;
+  }
+}
+
 .dropdown-loading {
   position: absolute;
   top: 0;

app/helpers/dropdowns_helper.rb

 module DropdownsHelper
-  def dropdown_tag(toggle_text, id: nil, toggle_class: nil, dropdown_class: nil, title: false, filter: false, placeholder: "", data: {}, &block)
+  def dropdown_tag(toggle_text, id: nil, toggle_class: nil, dropdown_class: nil, title: false, filter: false, placeholder: "", footer_content: false, data: {}, &block)
     content_tag :div, class: "dropdown" do
       toggle_hash = data.merge({toggle: "dropdown"})
 
@@ -33,7 +33,13 @@ module DropdownsHelper
         end
 
         output += content_tag :div, class: "dropdown-content" do
-          capture(&block) if block
+          capture(&block) if block && !footer_content
+        end
+
+        if block && footer_content
+          output += content_tag :div, class: "dropdown-footer" do
+            capture(&block)
+          end
         end
 
         output += content_tag :div, class: "dropdown-loading" do

app/views/shared/issuable/_filter.html.haml

@@ -25,7 +25,11 @@
 
         .filter-item.inline.labels-filter
           = dropdown_tag("Label", title: "Filter by label", toggle_class: "js-label-select", filter: true, dropdown_class: "dropdown-menu-labels dropdown-menu-selectable",
-            placeholder: "Search labels", data: {field_name: "label_name", selected: params[:label_name], project_id: @project.id})
+            placeholder: "Search labels", footer_content: true, data: {field_name: "label_name", selected: params[:label_name], project_id: @project.id}) do
+            %ul.dropdown-footer-list
+              %li
+                = link_to namespace_project_labels_path(@project.namespace, @project) do
+                  Manage labels
 
         .pull-right
           = render 'shared/sort_dropdown'