Use current trends for hashtag searching in composer

app/soapbox/actions/compose.ts

@@ -1,4 +1,5 @@
 import axios, { AxiosError, Canceler } from 'axios';
+import { List as ImmutableList } from 'immutable';
 import throttle from 'lodash/throttle';
 import { defineMessages, IntlShape } from 'react-intl';
 
@@ -23,7 +24,7 @@ import type { History } from 'history';
 import type { Emoji } from 'soapbox/components/autosuggest_emoji';
 import type { AutoSuggestion } from 'soapbox/components/autosuggest_input';
 import type { AppDispatch, RootState } from 'soapbox/store';
-import type { Account, APIEntity, Status } from 'soapbox/types/entities';
+import type { Account, APIEntity, Status, Tag } from 'soapbox/types/entities';
 
 const { CancelToken, isCancel } = axios;
 
@@ -505,7 +506,10 @@ const fetchComposeSuggestionsEmojis = (dispatch: AppDispatch, getState: () => Ro
 };
 
 const fetchComposeSuggestionsTags = (dispatch: AppDispatch, getState: () => RootState, token: string) => {
-  dispatch(updateSuggestionTags(token));
+  const state = getState();
+  const currentTrends = state.trends.items;
+
+  dispatch(updateSuggestionTags(token, currentTrends));
 };
 
 const fetchComposeSuggestions = (token: string) =>
@@ -561,9 +565,10 @@ const selectComposeSuggestion = (position: number, token: string | null, suggest
     });
   };
 
-const updateSuggestionTags = (token: string) => ({
+const updateSuggestionTags = (token: string, currentTrends: ImmutableList<Tag>) => ({
   type: COMPOSE_SUGGESTION_TAGS_UPDATE,
   token,
+  currentTrends,
 });
 
 const updateTagHistory = (tags: string[]) => ({

app/soapbox/reducers/__tests__/compose.test.ts

@@ -4,6 +4,7 @@ import * as actions from 'soapbox/actions/compose';
 import { ME_FETCH_SUCCESS, ME_PATCH_SUCCESS } from 'soapbox/actions/me';
 import { SETTING_CHANGE } from 'soapbox/actions/settings';
 import { TIMELINE_DELETE } from 'soapbox/actions/timelines';
+import { TagRecord } from 'soapbox/normalizers';
 import { normalizeStatus } from 'soapbox/normalizers/status';
 
 import reducer, { ReducerRecord } from '../compose';
@@ -401,6 +402,9 @@ describe('compose reducer', () => {
     const action = {
       type: actions.COMPOSE_SUGGESTION_TAGS_UPDATE,
       token: 'aaadken3',
+      currentTrends: ImmutableList([
+        TagRecord({ name: 'hashtag' }),
+      ]),
     };
     expect(reducer(state, action).toJS()).toMatchObject({
       suggestion_token: 'aaadken3',

app/soapbox/reducers/compose.ts

@@ -65,6 +65,7 @@ import type {
   APIEntity,
   Attachment as AttachmentEntity,
   Status as StatusEntity,
+  Tag,
 } from 'soapbox/types/entities';
 
 const getResetFileKey = () => Math.floor((Math.random() * 0x10000));
@@ -188,14 +189,14 @@ const insertSuggestion = (state: State, position: number, token: string, complet
   });
 };
 
-const updateSuggestionTags = (state: State, token: string) => {
+const updateSuggestionTags = (state: State, token: string, currentTrends: ImmutableList<Tag>) => {
   const prefix = token.slice(1);
 
   return state.merge({
-    suggestions: state.tagHistory
+    suggestions: ImmutableList(currentTrends
-      .filter(tag => tag.toLowerCase().startsWith(prefix.toLowerCase()))
+      .filter((tag) => tag.get('name').toLowerCase().startsWith(prefix.toLowerCase()))
       .slice(0, 4)
-      .map(tag => '#' + tag),
+      .map((tag) => '#' + tag.name)),
     suggestion_token: token,
   });
 };
@@ -406,7 +407,7 @@ export default function compose(state = ReducerRecord({ idempotencyKey: uuid(),
     case COMPOSE_SUGGESTION_SELECT:
       return insertSuggestion(state, action.position, action.token, action.completion, action.path);
     case COMPOSE_SUGGESTION_TAGS_UPDATE:
-      return updateSuggestionTags(state, action.token);
+      return updateSuggestionTags(state, action.token, action.currentTrends);
     case COMPOSE_TAG_HISTORY_UPDATE:
       return state.set('tagHistory', ImmutableList(fromJS(action.tags)) as ImmutableList<string>);
     case TIMELINE_DELETE: