Merge pull request matrix-org#4859 from matrix-org/t3chguy/dedup-rooms-autocomplete

De-duplicate rooms from the room autocomplete provider

Author: t3chguy

src/autocomplete/RoomProvider.tsx

@@ -25,9 +25,9 @@ import {MatrixClientPeg} from '../MatrixClientPeg';
 import QueryMatcher from './QueryMatcher';
 import {PillCompletion} from './Components';
 import * as sdk from '../index';
-import _sortBy from 'lodash/sortBy';
 import {makeRoomPermalink} from "../utils/permalinks/Permalinks";
 import {ICompletion, ISelectionRange} from "./Autocompleter";
+import { uniqBy, sortBy } from 'lodash';
 
 const ROOM_REGEX = /\B#\S*/g;
 
@@ -91,10 +91,11 @@ export default class RoomProvider extends AutocompleteProvider {
             this.matcher.setObjects(matcherObjects);
             const matchedString = command[0];
             completions = this.matcher.match(matchedString);
-            completions = _sortBy(completions, [
+            completions = sortBy(completions, [
                 (c) => score(matchedString, c.displayedAlias),
                 (c) => c.displayedAlias.length,
             ]);
+            completions = uniqBy(completions, (match) => match.room);
             completions = completions.map((room) => {
                 return {
                     completion: room.displayedAlias,