GitHub for Mac sucks, why does it leave out a file sometimes?

framework/core/js/forum/src/components/post-activity.js

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+import Component from 'flarum/component';
+import humanTime from 'flarum/helpers/human-time';
+import avatar from 'flarum/helpers/avatar';
+import listItems from 'flarum/helpers/list-items';
+import ItemList from 'flarum/utils/item-list';
+
+export default class PostActivity extends Component {
+  view() {
+    var activity = this.props.activity;
+    var user = activity.user();
+    var post = activity.post();
+    var discussion = post.discussion();
+
+    return m('div', [
+      avatar(user, {className: 'activity-icon'}),
+      m('div.activity-info', [
+        m('strong', post.number() == 1 ? 'Started a discussion' : 'Posted a reply'),
+        humanTime(activity.time())
+      ]),
+      m('a.activity-content.post-activity', {href: app.route('discussion.near', {
+        id: discussion.id(),
+        slug: discussion.slug(),
+        near: post.number()
+      }), config: m.route}, [
+        m('ul.list-inline', listItems(this.headerItems().toArray())),
+        m('div.body', m.trust(post.contentHtml()))
+      ])
+    ]);
+  }
+
+  headerItems() {
+    var items = new ItemList();
+
+    items.add('title', m('h3.title', this.props.activity.post().discussion().title()));
+
+    return items;
+  }
+}