Kill FuzzyMatcher

This has been commented out for ages. Just remove it and make things
use QueryMatcher directly rather than looking like they do fuzzy matching
but not.

src/autocomplete/UserProvider.js

@@ -23,7 +23,7 @@ import { _t } from '../languageHandler';
 import AutocompleteProvider from './AutocompleteProvider';
 import {PillCompletion} from './Components';
 import sdk from '../index';
-import FuzzyMatcher from './FuzzyMatcher';
+import QueryMatcher from './QueryMatcher';
 import _sortBy from 'lodash/sortBy';
 import MatrixClientPeg from '../MatrixClientPeg';
 
@@ -44,7 +44,7 @@ export default class UserProvider extends AutocompleteProvider {
     constructor(room) {
         super(USER_REGEX, FORCED_USER_REGEX);
         this.room = room;
-        this.matcher = new FuzzyMatcher([], {
+        this.matcher = new QueryMatcher([], {
             keys: ['name', 'userId'],
             shouldMatchPrefix: true,
             shouldMatchWordsOnly: false,
@@ -104,7 +104,9 @@ export default class UserProvider extends AutocompleteProvider {
         const fullMatch = command[0];
         // Don't search if the query is a single "@"
         if (fullMatch && fullMatch !== '@') {
-            completions = this.matcher.match(fullMatch).map((user) => {
+            // Don't include the '@' in our search query - it's only used as a way to trigger completion
+            const query = fullMatch.startsWith('@') ? fullMatch.substring(1) : fullMatch;
+            completions = this.matcher.match(query).map((user) => {
                 const displayName = (user.name || user.userId || '');
                 return {
                     // Length of completion should equal length of text in decorator. draft-js