Revert "MM-14761 Loading channel with lot of unreads should show load…

…er at the top (#2589)"

This reverts commit 3e88c52.

components/post_view/post_list.jsx

@@ -332,6 +332,7 @@ export default class PostList extends React.PureComponent {
  const didUserScrollBackwards = scrollDirection === 'backward' && !scrollUpdateWasRequested;
  const isOffsetWithInRange = scrollOffset < HEIGHT_TRIGGER_FOR_MORE_POSTS;
  if (isNotLoadingPosts && didUserScrollBackwards && isOffsetWithInRange && !this.state.atEnd) {
+ this.loadingMorePosts = true;
  this.loadMorePosts();
  }
 
@@ -409,16 +410,7 @@ export default class PostList extends React.PureComponent {
  const newMessagesSeparatorIndex = this.state.postListIds.findIndex(
  (item) => item.indexOf(PostListRowListIds.START_OF_NEW_MESSAGES) === 0
  );
-
  if (newMessagesSeparatorIndex > 0) {
- const topMostPostIndex = getClosestValidPostIndex(this.state.postListIds, this.state.postListIds.length);
- if (newMessagesSeparatorIndex === topMostPostIndex + 1) {
- this.loadMorePosts();
- return {
- index: this.state.postListIds.length - 1,
- position: 'start',
- };
- }
  return {
  index: newMessagesSeparatorIndex,
  position: 'start',