FIX: when replying to a expanded reply, correctly attribute author

app/assets/javascripts/discourse/controllers/quote-button.js.es6

@@ -43,8 +43,7 @@ export default Ember.Controller.extend({
     if (this.get('buffer') === selectedText) return;
 
     // we need to retrieve the post data from the posts collection in the topic controller
-    const postStream = this.get('controllers.topic.model.postStream');
-    this.set('post', postStream.findLoadedPost(postId));
+    this.set('postId', postId);
     this.set('buffer', selectedText);
 
     // create a marker element
@@ -87,7 +86,17 @@ export default Ember.Controller.extend({
 
   quoteText() {
 
-    const post = this.get('post');
+    const postStream = this.get('controllers.topic.model.postStream');
+    const postId = this.get('postId');
+    const post = postStream.findLoadedPost(postId);
+
+    // defer load if needed, if in an expanded replies section
+    if (!post) {
+      postStream.loadPost(postId).then(() => {
+        this.quoteText();
+      });
+      return;
+    }
 
     // If we can't create a post, delegate to reply as new topic
     if (!this.get('controllers.topic.model.details.can_create_post')) {
@@ -98,7 +107,7 @@ export default Ember.Controller.extend({
     const composerController = this.get('controllers.composer');
     const composerOpts = {
       action: Discourse.Composer.REPLY,
-      draftKey: this.get('post.topic.draft_key')
+      draftKey: post.get('topic.draft_key')
     };
 
     if(post.get('post_number') === 1) {

app/assets/javascripts/discourse/models/post-stream.js.es6

@@ -441,6 +441,14 @@ const PostStream = RestModel.extend({
     return this.get('postIdentityMap').get(id);
   },
 
+  loadPost(postId){
+    const url = "/posts/" + postId;
+    const store = this.store;
+
+    return Discourse.ajax(url).then((p) =>
+        this.storePost(store.createRecord('post', p)));
+  },
+
   /**
     Finds and adds a post to the stream by id. Typically this would happen if we receive a message
     from the message bus indicating there's a new post. We'll only insert it if we currently

app/assets/javascripts/discourse/views/embedded-post.js.es6

@@ -3,6 +3,8 @@ import ScreenTrack from 'discourse/lib/screen-track';
 export default Discourse.GroupedView.extend({
   templateName: 'embedded-post',
   classNames: ['reply'],
+  attributeBindings: ['data-post-id'],
+  'data-post-id': Em.computed.alias('content.id'),
 
   _startTracking: function() {
     const post = this.get('content');

app/assets/javascripts/discourse/views/quote-button.js.es6

@@ -78,7 +78,7 @@ export default Ember.View.extend({
     // breaks if quoting has been disabled by the user
     if (!Discourse.User.currentProp('enable_quoting')) return;
     // retrieve the post id from the DOM
-    const postId = $target.closest('.boxed').data('post-id');
+    const postId = $target.closest('.boxed, .reply').data('post-id');
     // select the text
     if (postId) controller.selectText(postId);
   },