FIX: Scrollbar wouldn't reach the bottom if you scrolled too fast

app/assets/javascripts/discourse/components/scrolling-post-stream.js.es6

@@ -92,6 +92,8 @@ export default MountWidget.extend({
     // uncomment to debug the eyeline
     // $('.debug-eyeline').css({ height: '1px', width: '100%', backgroundColor: 'blue', position: 'absolute', top: `${topCheck}px` });
 
+    let allAbove = true;
+
     let bottomView = topView;
     while (bottomView < $posts.length) {
       const post = $posts[bottomView];
@@ -103,6 +105,8 @@ export default MountWidget.extend({
       const postHeight = $post.height();
       const viewBottom = Math.ceil(viewTop + postHeight);
 
+      allAbove = allAbove && (viewTop < topCheck);
+
       if (viewTop > viewportBottom) { break; }
 
       if (viewBottom >= windowTop && viewTop <= windowBottom) {
@@ -115,10 +119,14 @@ export default MountWidget.extend({
       }
 
       nearby.push(bottomView);
-
       bottomView++;
     }
 
+    if (allAbove) {
+      if (percent === null) { percent = 1.0; }
+      if (currentPost === null) { currentPost = bottomView - 1; }
+    }
+
     const posts = this.posts;
     const refresh = cb => this.queueRerender(cb);
     if (onscreen.length) {

app/assets/javascripts/discourse/components/site-header.js.es6

@@ -68,8 +68,6 @@ const SiteHeaderComponent = MountWidget.extend(Docking, {
   willDestroyElement() {
     this._super();
     $('body').off('keydown.header');
-    this.appEvents.off('notifications:changed');
-    this.appEvents.off('header:keyboard-trigger');
     $(window).off('resize.discourse-menu-panel');
 
     this.appEvents.off('header:show-topic');

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

@@ -55,10 +55,5 @@ export default MountWidget.extend(Docking, {
   didInsertElement() {
     this._super();
     this.dispatch('topic:current-post-scrolled', 'timeline-scrollarea');
-  },
-
-  willDestroyElement() {
-    this._super();
-    this.appEvents.off('topic:current-post-scrolled');
   }
 });

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

@@ -171,7 +171,6 @@ createWidget('timeline-scrollarea', {
 
   topicCurrentPostScrolled(event) {
     const { postIndex, percent } = event;
-
     this.state.percentage = this._percentFor(this.attrs.topic, parseFloat(postIndex) + percent);
   },