fix tests, add performance test (skipped, doesn't assert anything),

tweak max mentions count

src/components/mention_link/mention_link.js

@@ -41,7 +41,7 @@ const MentionLink = {
   },
   computed: {
     user () {
-      return this.url && this.$store.getters.findUserByUrl(this.url)
+      return this.url && this.$store && this.$store.getters.findUserByUrl(this.url)
     },
     isYou () {
       // FIXME why user !== currentUser???

src/components/mentions_line/mentions_line.js

@@ -15,7 +15,7 @@ const MentionsLine = {
   },
   computed: {
     limit () {
-      return 2
+      return 5
     },
     mentionsComputed () {
       return this.mentions.slice(0, this.limit)

src/components/rich_content/rich_content.jsx

@@ -159,7 +159,7 @@ export default Vue.component('RichContent', {
               return item // We'll handle it later
             }
           case 'span':
-            if (attrs['class'].includes('h-card')) {
+            if (this.handleLinks && attrs['class'] && attrs['class'].includes('h-card')) {
               return ['', children.map(processItem), '']
             }
         }