FIX: When expanding embedded replies, adjust the scroll position to not lose your place

app/assets/javascripts/discourse/controllers/topic_controller.js

@@ -308,24 +308,6 @@ Discourse.TopicController = Discourse.ObjectController.extend(Discourse.Selected
     this.get('content').toggleStar();
   },
 
-  /**
-    Toggle the replies this post is a reply to
-
-    @method showReplyHistory
-  **/
-  toggleReplyHistory: function(post) {
-    var replyHistory = post.get('replyHistory'),
-        topicController = this;
-
-    if (replyHistory.length > 0) {
-      replyHistory.clear();
-    } else {
-      post.set('loadingReplyHistory', true);
-      topicController.get('postStream').findReplyHistory(post).then(function () {
-        post.set('loadingReplyHistory', false);
-      });
-    }
-  },
 
   /**
     Clears the pin from a topic for the currently logged in user

app/assets/javascripts/discourse/templates/post.js.handlebars

@@ -5,7 +5,7 @@
 <article class='boxed' {{bindAttr id="postElementId"}} {{bindAttr data-post-id="id"}} data-user-id="{{unbound user_id}}">
   <div class='row'>
     {{#if showUserReplyTab}}
-      <a href='#' {{action toggleReplyHistory this}} class='reply-to-tab'>
+      <a href='#' {{action toggleReplyHistory this target="view"}} class='reply-to-tab'>
         {{#if loadingReplyHistory}}
           {{i18n loading}}
         {{else}}

app/assets/javascripts/discourse/views/embedded_post_view.js

@@ -11,7 +11,8 @@ Discourse.EmbeddedPostView = Discourse.GroupedView.extend({
   classNames: ['reply'],
 
   didInsertElement: function() {
-    Discourse.ScreenTrack.current().track(this.get('elementId'), this.get('post.post_number'));
+    var post = this.get('content');
+    Discourse.ScreenTrack.current().track(this.get('elementId'), post.get('post_number'));
   },
 
   willDestroyElement: function() {

app/assets/javascripts/discourse/views/post_view.js

@@ -135,6 +135,39 @@ Discourse.PostView = Discourse.GroupedView.extend({
     }
   },
 
+  /**
+    Toggle the replies this post is a reply to
+
+    @method showReplyHistory
+  **/
+  toggleReplyHistory: function(post) {
+
+    var replyHistory = post.get('replyHistory'),
+        topicController = this.get('controller'),
+        origScrollTop = $(window).scrollTop();
+
+
+    if (replyHistory.length > 0) {
+      var origHeight = this.$('.embedded-posts.top').height();
+
+      replyHistory.clear();
+      Em.run.next(function() {
+        $(window).scrollTop(origScrollTop - origHeight);
+      });
+    } else {
+      post.set('loadingReplyHistory', true);
+
+      var self = this;
+      topicController.get('postStream').findReplyHistory(post).then(function () {
+        post.set('loadingReplyHistory', false);
+
+        Em.run.next(function() {
+          $(window).scrollTop(origScrollTop + self.$('.embedded-posts.top').height());
+        });
+      });
+    }
+  },
+
   // Add the quote controls to a post
   insertQuoteControls: function() {
     var postView = this;