refactor: Add code quality reports

lib/pages/chat.dart

@@ -601,7 +601,7 @@ class ChatController extends State<Chat> {
 
   void scrollDown() => scrollController.jumpTo(0);
 
-  void onEmojiSelected(category, emoji) {
+  void onEmojiSelected(_, emoji) {
     setState(() => showEmojiPicker = false);
     if (emoji == null) return;
     // make sure we don't send the same emoji twice
@@ -721,7 +721,7 @@ class ChatController extends State<Chat> {
     return index + 1;
   }
 
-  void onInputBarSubmitted(String text) {
+  void onInputBarSubmitted(_) {
     send();
     FocusScope.of(context).requestFocus(inputFocus);
   }

lib/pages/homeserver_picker.dart

@@ -92,6 +92,7 @@ class HomeserverPickerController extends State<HomeserverPicker> {
         if (token != null) _loginWithToken(token);
       });
     }
+    checkHomeserverAction();
   }
 
   @override
@@ -104,7 +105,7 @@ class HomeserverPickerController extends State<HomeserverPicker> {
   /// makes sure that it is prefixed with https. Then it searches for the
   /// well-known information and forwards to the login page depending on the
   /// login type.
-  void checkHomeserverAction() async {
+  Future<void> checkHomeserverAction() async {
     _coolDown?.cancel();
     try {
       if (domain.isEmpty) throw L10n.of(context).changeTheHomeserver;
@@ -220,15 +221,9 @@ class HomeserverPickerController extends State<HomeserverPicker> {
 
   void signUpAction() => VRouter.of(context).to('signup');
 
-  bool _initialized = false;
-
   @override
   Widget build(BuildContext context) {
     Matrix.of(context).navigatorContext = context;
-    if (!_initialized) {
-      _initialized = true;
-      checkHomeserverAction();
-    }
     return HomeserverPickerView(this);
   }
 }

lib/pages/recording_dialog.dart

@@ -28,7 +28,7 @@ class _RecordingDialogState extends State<RecordingDialog> {
   final _audioRecorder = Record();
   Amplitude _amplitude;
 
-  void startRecording() async {
+  Future<void> startRecording() async {
     try {
       final tempDir = await getTemporaryDirectory();
       _recordedPath =

lib/pages/search.dart

@@ -124,7 +124,7 @@ class SearchController extends State<Search> {
         'user_id': text,
       }));
     }
-    setState(() {});
+    setState(() => null);
   }
 
   bool _init = false;

lib/pages/views/search_view.dart

@@ -63,8 +63,9 @@ class SearchView extends StatelessWidget {
               .toLowerCase()
               .contains(controller.controller.text.toLowerCase()),
     );
+    const tabCount = 3;
     return DefaultTabController(
-      length: 3,
+      length: tabCount,
       initialIndex:
           controller.controller.text?.startsWith('#') ?? false ? 0 : 1,
       child: Scaffold(
@@ -171,7 +172,8 @@ class SearchView extends StatelessWidget {
                         shrinkWrap: true,
                         padding: const EdgeInsets.all(12),
                         physics: const NeverScrollableScrollPhysics(),
-                        gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
+                        gridDelegate:
+                            const SliverGridDelegateWithFixedCrossAxisCount(
                           crossAxisCount: 2,
                           childAspectRatio: 1,
                           crossAxisSpacing: 16,