MM-13180 Call load posts earlier for infinite scroll

components/post_view/post_list.jsx

@@ -435,6 +435,7 @@ export default class PostList extends React.PureComponent {
  // Only count as user scroll if we've already performed our first load scroll
  this.hasScrolled = this.hasScrolledToNewMessageSeparator || this.hasScrolledToFocusedPost;
  const postList = this.postListRef.current;
+ const postListScrollTop = postList.scrollTop;
 
  this.updateFloatingTimestamp();
 
@@ -452,7 +453,9 @@ export default class PostList extends React.PureComponent {
  });
  }
 
- if (postList.scrollTop <= 0.5 * postList.clientHeight && !this.state.loadingPosts && !this.state.atEnd && this.state.autoRetryEnable) {
+ const didScrollPastLoadingPoint = postListScrollTop < 0.3 * (postList.scrollHeight - postList.clientHeight);
+
+ if ((didScrollPastLoadingPoint || postListScrollTop < 300) && !this.state.loadingPosts && !this.state.atEnd && this.state.autoRetryEnable) {
  this.setState({loadingPosts: true});
  this.loadMorePosts();
  }