autocomplete [nfc]: Cut separate cache param on testUser, reuse store

Since 9815022, this method already takes the whole store, which
it uses in order to identify muted users.  So it can get the
autocomplete-data cache from the store just as well as its
caller can.

Author: gnprice

lib/model/autocomplete.dart

@@ -12,7 +12,6 @@ import 'compose.dart';
 import 'emoji.dart';
 import 'narrow.dart';
 import 'store.dart';
-import 'user.dart';
 
 extension ComposeContentAutocomplete on ComposeContentController {
   AutocompleteIntent<ComposeAutocompleteQuery>? autocompleteIntent() {
@@ -649,7 +648,7 @@ class MentionAutocompleteView extends AutocompleteView<MentionAutocompleteQuery,
   }
 
   MentionAutocompleteResult? _testUser(MentionAutocompleteQuery query, User user) {
-    return query.testUser(user, store.autocompleteViewManager.autocompleteDataCache, store);
+    return query.testUser(user, store);
   }
 
   @override
@@ -753,10 +752,11 @@ class MentionAutocompleteQuery extends ComposeAutocompleteQuery {
     return WildcardMentionAutocompleteResult(wildcardOption: wildcardOption);
   }
 
-  MentionAutocompleteResult? testUser(User user, AutocompleteDataCache cache, UserStore store) {
+  MentionAutocompleteResult? testUser(User user, PerAccountStore store) {
     if (!user.isActive) return null;
     if (store.isUserMuted(user.userId)) return null;
 
+    final cache = store.autocompleteViewManager.autocompleteDataCache;
     // TODO(#236) test email too, not just name
     if (!_testName(user, cache)) return null;
 

test/model/autocomplete_test.dart

@@ -407,8 +407,7 @@ void main() {
     late PerAccountStore store;
 
     void doCheck(String rawQuery, User user, bool expected) {
-      final result = MentionAutocompleteQuery(rawQuery)
-        .testUser(user, AutocompleteDataCache(), store);
+      final result = MentionAutocompleteQuery(rawQuery).testUser(user, store);
       expected
         ? check(result).isA<UserMentionAutocompleteResult>()
         : check(result).isNull();