FIX: Progress was broken on mobile

app/assets/javascripts/discourse/components/topic-progress.js.es6

@@ -171,7 +171,7 @@ export default Ember.Component.extend({
       }
       this.set('toPostIndex', postIndex);
       this.set('expanded', false);
-      this.sendAction('jumpToPost', postIndex);
+      this.sendAction('jumpToIndex', postIndex);
     },
 
     jumpTop() {

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

@@ -191,9 +191,13 @@ export default Ember.Controller.extend(SelectedPostsCount, BufferedContent, {
       if (!post) { return; }
 
       const postNumber = post.get('post_number');
-      this.set('model.currentPost', postNumber);
+      const model = this.get('model');
+      model.set('currentPost', postNumber);
       this.send('postChangedRoute', postNumber);
-      this.appEvents.trigger('topic:current-post-changed', postNumber);
+
+      const postStream = model.get('postStream');
+
+      this.appEvents.trigger('topic:current-post-changed', postStream.progressIndexOfPost(post));
     },
 
     // Called the the topmost visible post on the page changes.
@@ -391,25 +395,12 @@ export default Ember.Controller.extend(SelectedPostsCount, BufferedContent, {
       }
     },
 
+    jumpToIndex(index) {
+      this._jumpToPostId(this.get('model.postStream.stream')[index-1]);
+    },
+
     jumpToPost(postNumber) {
-      const topic = this.get('model');
+      this._jumpToPostId(this.get('model.postStream').findPostIdForPostNumber(postNumber));
-      const stream = topic.get('postStream');
-      const postId = stream.findPostIdForPostNumber(postNumber);
-
-      if (!postId) {
-        Em.Logger.warn("jump-post code broken - requested an index outside the stream array");
-        return;
-      }
-
-      const post = stream.findLoadedPost(postId);
-      if (post) {
-        DiscourseURL.routeTo(topic.urlForPostNumber(post.get('post_number')));
-      } else {
-        // need to load it
-        stream.findPostsByIds([postId]).then(arr => {
-          DiscourseURL.routeTo(topic.urlForPostNumber(arr[0].get('post_number')));
-        });
-      }
     },
 
     jumpTop() {
@@ -647,6 +638,25 @@ export default Ember.Controller.extend(SelectedPostsCount, BufferedContent, {
     }
   },
 
+  _jumpToPostId(postId) {
+    if (!postId) {
+      Ember.Logger.warn("jump-post code broken - requested an index outside the stream array");
+      return;
+    }
+
+    const topic = this.get('model');
+    const postStream = topic.get('postStream');
+    const post = postStream.findLoadedPost(postId);
+    if (post) {
+      DiscourseURL.routeTo(topic.urlForPostNumber(post.get('post_number')));
+    } else {
+      // need to load it
+      postStream.findPostsByIds([postId]).then(arr => {
+        DiscourseURL.routeTo(topic.urlForPostNumber(arr[0].get('post_number')));
+      });
+    }
+  },
+
   togglePinnedState() {
     this.send('togglePinnedForUser');
   },

app/assets/javascripts/discourse/templates/topic.hbs

@@ -76,12 +76,14 @@
                              loading=model.postStream.loading
                              jumpTop="jumpTop"
                              jumpToPost="jumpToPost"
+                             jumpToIndex="jumpToIndex"
                              jumpBottom="jumpBottom"
                              replyToPost="replyToPost"}}
           {{else}}
             {{topic-progress topic=model
                              jumpTop="jumpTop"
                              jumpToPost="jumpToPost"
+                             jumpToIndex="jumpToIndex"
                              jumpBottom="jumpBottom"}}
           {{/if}}
           {{conditional-loading-spinner condition=model.postStream.loadingAbove}}

app/assets/javascripts/discourse/widgets/topic-timeline.js.es6

@@ -90,7 +90,7 @@ createWidget('timeline-scrollarea', {
     const { attrs } = this;
     const percentage = this.state.percentage;
     const postStream = attrs.topic.get('postStream');
-    const total = attrs.topic.get('highest_post_number');
+    const total = postStream.get('filteredPostsCount');
     let current = Math.round(total * percentage);
 
     if (current < 1) { current = 1; }
@@ -157,13 +157,13 @@ createWidget('timeline-scrollarea', {
 
   commit() {
     const position = this.position();
-    this.sendWidgetAction('jumpToPost', position.current);
+    this.sendWidgetAction('jumpToIndex', position.current);
   },
 
   topicCurrentPostChanged(postNumber) {
     // If the post number didn't change keep our scroll position
     if (postNumber !== this.state.scrolledPost) {
-      const total = this.attrs.topic.get('highest_post_number');
+      const total = this.attrs.topic.get('postStream.filteredPostsCount');
       const perc = postNumber === 1 ? 0.0 : parseFloat(postNumber) / total;
       this.state.percentage = perc;
     }