refactor: Update flutter lints

lib/pages/chat/chat.dart

@@ -118,9 +118,9 @@ class ChatController extends State<ChatPageWithRoom>
   bool currentlyTyping = false;
   bool dragging = false;
 
-  void onDragEntered(_) => setState(() => dragging = true);
+  void onDragEntered(dynamic _) => setState(() => dragging = true);
 
-  void onDragExited(_) => setState(() => dragging = false);
+  void onDragExited(dynamic _) => setState(() => dragging = false);
 
   void onDragDone(DropDoneDetails details) async {
     setState(() => dragging = false);
@@ -148,7 +148,8 @@ class ChatController extends State<ChatPageWithRoom>
         MessageTypes.File,
       }.contains(selectedEvents.single.messageType);
 
-  void saveSelectedEvent(context) => selectedEvents.single.saveFile(context);
+  void saveSelectedEvent(BuildContext context) =>
+      selectedEvents.single.saveFile(context);
 
   List<Event> selectedEvents = [];
 
@@ -213,7 +214,7 @@ class ChatController extends State<ChatPageWithRoom>
     context.go('/rooms');
   }
 
-  void requestHistory([_]) async {
+  void requestHistory([dynamic _]) async {
     Logs().v('Requesting history...');
     await timeline?.requestHistory(historyCount: _loadHistoryCount);
   }
@@ -254,7 +255,7 @@ class ChatController extends State<ChatPageWithRoom>
     }
   }
 
-  void _shareItems([_]) {
+  void _shareItems([dynamic _]) {
     final shareItems = widget.shareItems;
     if (shareItems == null || shareItems.isEmpty) return;
     if (!room.otherPartyCanReceiveMessages) {
@@ -1062,7 +1063,7 @@ class ChatController extends State<ChatPageWithRoom>
     scrollController.jumpTo(0);
   }
 
-  void onEmojiSelected(_, Emoji? emoji) {
+  void onEmojiSelected(dynamic _, Emoji? emoji) {
     typeEmoji(emoji);
     onInputBarChanged(sendController.text);
   }
@@ -1185,7 +1186,7 @@ class ChatController extends State<ChatPageWithRoom>
     return index + 1;
   }
 
-  void onInputBarSubmitted(_) {
+  void onInputBarSubmitted(String _) {
     send();
     FocusScope.of(context).requestFocus(inputFocus);
   }
@@ -1221,7 +1222,7 @@ class ChatController extends State<ChatPageWithRoom>
     }
   }
 
-  unpinEvent(String eventId) async {
+  void unpinEvent(String eventId) async {
     final response = await showOkCancelAlertDialog(
       context: context,
       title: L10n.of(context).unpin,

lib/pages/chat/events/cute_events.dart

@@ -69,7 +69,7 @@ class _CuteContentState extends State<CuteContent> {
     Overlay.of(context).insert(overlay);
   }
 
-  generateLabel(User? user) {
+  String? generateLabel(User? user) {
     switch (widget.event.content['cute_type']) {
       case 'googly_eyes':
         return L10n.of(context).googlyEyesContent(
@@ -90,6 +90,7 @@ class _CuteContentState extends State<CuteContent> {
               '',
         );
     }
+    return null;
   }
 }
 

lib/pages/chat/start_poll_bottom_sheet.dart

@@ -56,7 +56,7 @@ class _StartPollBottomSheetState extends State<StartPollBottomSheet> {
     }
   }
 
-  void _updateCanCreate([_]) {
+  void _updateCanCreate([dynamic _]) {
     final newCanCreate = _bodyController.text.trim().isNotEmpty &&
         !_answers.any((controller) => controller.text.trim().isEmpty);
     if (_canCreate != newCanCreate) {