Use op-auto-complete in comment field and add test

frontend/app/components/inplace-edit/field-directives/edit-wiki-textarea/edit-wiki-textarea.directive.html

@@ -6,6 +6,7 @@
   </label>
   <textarea
           wiki-toolbar
+          op-auto-complete
           style="min-height: 114px"
           msd-elastic="\n"
           class="focus-input inplace-edit--textarea -animated"

frontend/app/components/work-packages/work-package-comment/work-package-comment.directive.js

@@ -31,7 +31,7 @@ angular
   .directive('workPackageComment', workPackageComment);
 
 function workPackageComment($timeout, $location, EditableFieldsState, FocusHelper,
-  inplaceEditMultiStorage, ConfigurationService, AutoCompleteHelper, inplaceEditAll) {
+  inplaceEditMultiStorage, ConfigurationService, inplaceEditAll) {
 
   function commentFieldDirectiveController($scope, $element) {
     var field = {
@@ -163,12 +163,6 @@ function workPackageComment($timeout, $location, EditableFieldsState, FocusHelpe
 
     controllerAs: 'fieldController',
     bindToController: true,
-    controller: commentFieldDirectiveController,
-
-    link: function(scope, element) {
-      $timeout(function() {
-        AutoCompleteHelper.enableTextareaAutoCompletion(element.find('textarea'));
-      });
-    }
+    controller: commentFieldDirectiveController
   };
 }

spec/features/work_packages/details/activity_comments_spec.rb

@@ -119,6 +119,15 @@ describe 'activity comments', js: true, selenium: true do
         end
       end
 
+      describe 'autocomplete' do
+        let!(:wp2) { FactoryGirl.create(:work_package, project: project, subject: 'AutoFoo') }
+
+        it 'autocompletes the other work package' do
+          comment_field.input_element.send_keys("##{wp2.id}")
+          expect(page).to have_selector('.atwho-view-ul li', text: wp2.to_s.strip)
+        end
+      end
+
       describe 'quoting' do
         it 'can quote a previous comment' do
           expect(page).to have_selector('.user-comment .message',