fix: filter result rendering fixed in topics

src/discussions/posts/data/slices.js

@@ -94,7 +94,13 @@ const threadsSlice = createSlice({
       }
       state.status = RequestStatus.SUCCESSFUL;
       state.threadsById = { ...state.threadsById, ...payload.threadsById };
-      state.threadsInTopic = mergeThreadsInTopics(state.threadsInTopic, payload.threadsInTopic);
+      // filter
+      if (payload.isFilterChanged) {
+        state.threadsInTopic = { ...payload.threadsInTopic };
+      } else {
+        state.threadsInTopic = mergeThreadsInTopics(state.threadsInTopic, payload.threadsInTopic);
+      }
+
       state.avatars = { ...state.avatars, ...payload.avatars };
       state.nextPage = (payload.page < payload.pagination.numPages) ? payload.page + 1 : null;
       state.totalPages = payload.pagination.numPages;

src/discussions/posts/data/thunks.js

@@ -102,6 +102,7 @@ export function fetchThreads(courseId, {
   author = null,
   filters = {},
   page = 1,
+  isFilterChanged,
   countFlagged,
 } = {}) {
   const options = {
@@ -141,7 +142,7 @@ export function fetchThreads(courseId, {
       const data = await getThreads(courseId, options);
       const normalisedData = normaliseThreads(camelCaseObject(data), topicIds);
       dispatch(fetchThreadsSuccess({
-        ...normalisedData, page, author, textSearchRewrite: data.text_search_rewrite,
+        ...normalisedData, page, author, textSearchRewrite: data.text_search_rewrite, isFilterChanged,
       }));
     } catch (error) {
       if (getHttpErrorStatus(error) === 403) {