FIX: Reply As New Topic from all 3 different places

app/assets/javascripts/discourse/controllers/share.js.es6

@@ -33,7 +33,8 @@ export default Ember.Controller.extend({
     replyAsNewTopic() {
       const topicController = this.get("controllers.topic");
       const postStream = topicController.get("model.postStream");
-      const post = postStream.findLoadedPost(this.get("postId"));
+      const postId = this.get("postId") || postStream.findPostIdForPostNumber(1);
+      const post = postStream.findLoadedPost(postId);
       topicController.send("replyAsNewTopic", post);
       this.send("close");
     },

app/assets/javascripts/discourse/views/share.js.es6

@@ -92,7 +92,7 @@ export default Ember.View.extend({
       const $currentTarget = $(e.currentTarget),
             url = $currentTarget.data('share-url'),
             postNumber = $currentTarget.data('post-number'),
-            postId = $currentTarget.data('post-id'),
+            postId = $currentTarget.closest('article').data('post-id'),
             date = $currentTarget.children().data('time');
       showPanel($currentTarget, url, postNumber, date, postId);
       return false;

app/assets/javascripts/discourse/widgets/post.js.es6

@@ -162,7 +162,6 @@ createWidget('post-meta-data', {
             href: attrs.shareUrl,
             'data-share-url': attrs.shareUrl,
             'data-post-number': attrs.post_number,
-            'data-post-id': attrs.id,
           }
         }, dateNode(createdAt))
       ));