Improve thread loading (#4402)

* Increase the number of posts loaded when a self-thread is present

* Increase depth to 10, detect cutoffs on self-threads and show continue link

* Stacky the avis

src/view/com/post-thread/PostThread.tsx

@@ -34,6 +34,7 @@ import {ComposePrompt} from '../composer/Prompt'
 import {List, ListMethods} from '../util/List'
 import {ViewHeader} from '../util/ViewHeader'
 import {PostThreadItem} from './PostThreadItem'
+import {PostThreadLoadMore} from './PostThreadLoadMore'
 import {PostThreadShowHiddenReplies} from './PostThreadShowHiddenReplies'
 
 // FlatList maintainVisibleContentPosition breaks if too many items
@@ -364,6 +365,9 @@ export function PostThread({
         </View>
       )
     } else if (isThreadPost(item)) {
+      if (!treeView && item.ctx.hasMoreSelfThread) {
+        return <PostThreadLoadMore post={item.post} />
+      }
       const prev = isThreadPost(posts[index - 1])
         ? (posts[index - 1] as ThreadPost)
         : undefined