Fix lodaing missing messages after search bug (#5080)

webapp/actions/global_actions.jsx

@@ -256,7 +256,7 @@ export function emitLoadMorePostsFocusedTopEvent() {
 }
 
 export function loadMorePostsTop(id, isFocusPost) {
-    const earliestPostId = PostStore.getEarliestPost(id).id;
+    const earliestPostId = PostStore.getEarliestPostFromPage(id).id;
     if (PostStore.requestVisibilityIncrease(id, Constants.POST_CHUNK_SIZE)) {
         loadPostsBefore(earliestPostId, 0, Constants.POST_CHUNK_SIZE, isFocusPost);
     }

webapp/actions/post_actions.jsx

@@ -167,6 +167,7 @@ export function loadPostsPage(channelId = ChannelStore.getCurrentId(), max = Con
                 before: true,
                 numRequested: numPosts,
                 checkLatest: true,
+                checkEarliest: true,
                 post_list: data
             });
 
@@ -195,6 +196,7 @@ export function loadPostsBefore(postId, offset, numPost, isPost) {
                 type: ActionTypes.RECEIVED_POSTS,
                 id: channelId,
                 before: true,
+                checkEarliest: true,
                 numRequested: numPost,
                 post_list: data,
                 isPost

webapp/stores/post_store.jsx

@@ -23,6 +23,7 @@ class PostStoreClass extends EventEmitter {
         this.selectedPostId = null;
         this.postsInfo = {};
         this.latestPageTime = {};
+        this.earliestPostFromPage = {};
         this.currentFocusedPostId = null;
     }
     emitChange() {
@@ -116,20 +117,8 @@ class PostStoreClass extends EventEmitter {
         return null;
     }
 
-    getEarliestPost(id) {
+    getEarliestPostFromPage(id) {
-        if (this.postsInfo.hasOwnProperty(id)) {
+        return this.earliestPostFromPage[id];
-            const postList = this.postsInfo[id].postList;
-
-            for (let i = postList.order.length - 1; i >= 0; i--) {
-                const postId = postList.order[i];
-
-                if (postList.posts[postId].state !== Constants.POST_DELETED) {
-                    return postList.posts[postId];
-                }
-            }
-        }
-
-        return null;
     }
 
     getLatestPost(id) {
@@ -207,7 +196,7 @@ class PostStoreClass extends EventEmitter {
         return this.currentFocusedPostId;
     }
 
-    storePosts(id, newPosts, checkLatest) {
+    storePosts(id, newPosts, checkLatest, checkEarliest) {
         if (isPostListNull(newPosts)) {
             return;
         }
@@ -225,6 +214,17 @@ class PostStoreClass extends EventEmitter {
             }
         }
 
+        if (checkEarliest) {
+            const currentEarliest = this.earliestPostFromPage[id] || {create_at: Number.MAX_SAFE_INTEGER};
+            const orderLength = newPosts.order.length;
+            if (orderLength >= 1) {
+                const newEarliestPost = newPosts.posts[newPosts.order[orderLength - 1]];
+                if (newEarliestPost.create_at < currentEarliest.create_at) {
+                    this.earliestPostFromPage[id] = newEarliestPost;
+                }
+            }
+        }
+
         const combinedPosts = makePostListNonNull(this.getAllPosts(id));
 
         for (const pid in newPosts.posts) {
@@ -638,10 +638,10 @@ PostStore.dispatchToken = AppDispatcher.register((payload) => {
     switch (action.type) {
     case ActionTypes.RECEIVED_POSTS: {
         if (PostStore.currentFocusedPostId !== null && action.isPost) {
-            PostStore.storePosts(PostStore.currentFocusedPostId, makePostListNonNull(action.post_list), action.checkLatest);
+            PostStore.storePosts(PostStore.currentFocusedPostId, makePostListNonNull(action.post_list), action.checkLatest, action.checkEarliest);
             PostStore.checkBounds(PostStore.currentFocusedPostId, action.numRequested, makePostListNonNull(action.post_list), action.before);
         }
-        PostStore.storePosts(action.id, makePostListNonNull(action.post_list), action.checkLatest);
+        PostStore.storePosts(action.id, makePostListNonNull(action.post_list), action.checkLatest, action.checkEarliest);
         PostStore.checkBounds(action.id, action.numRequested, makePostListNonNull(action.post_list), action.before);
         PostStore.emitChange();
         break;