flutter: Clean up

src/ui/flutter_app/lib/services/audios.dart

@@ -67,12 +67,6 @@ class Audios {
     _alarmSoundStreamId = await _soundpool!.play(await soundId);
   }
 
-  static Future<void> _pauseSound() async {
-    if (_alarmSoundStreamId != null && _alarmSoundStreamId! > 0) {
-      await _soundpool!.pause(_alarmSoundStreamId!);
-    }
-  }
-
   static Future<void> _stopSound() async {
     if (_alarmSoundStreamId != null && _alarmSoundStreamId! > 0) {
       await _soundpool!.stop(_alarmSoundStreamId!);

src/ui/flutter_app/lib/widgets/game_page.dart

@@ -49,9 +49,7 @@ class GamePage extends StatefulWidget {
 }
 
 class _GamePageState extends State<GamePage> with RouteAware {
-  // TODO: null-safety
   String? _status = '';
-  //bool _searching = false;
   bool isReady = false;
   late Timer timer;
 
@@ -135,7 +133,6 @@ class _GamePageState extends State<GamePage> with RouteAware {
     int? sq = indexToSquare[index];
 
     if (sq == null) {
-      //print("putPiece skip index: $index");
       return;
     }
 
@@ -243,7 +240,7 @@ class _GamePageState extends State<GamePage> with RouteAware {
         // TODO: Need Others?
         // Increment ply counters. In particular,
         // rule50 will be reset to zero later on
-        // in case of a capture.
+        // in case of a remove.
         ++position.gamePly;
         ++position.st.rule50;
         ++position.st.pliesFromNull;
@@ -321,7 +318,6 @@ class _GamePageState extends State<GamePage> with RouteAware {
           Move mv = response.value;
           final Move move = new Move(mv.move);
 
-          //Battle.instance.move = move;
           Game.instance.doMove(move.move);
           showTips();
           break;

src/ui/flutter_app/lib/widgets/game_settings_page.dart

@@ -65,12 +65,6 @@ class _GameSettingsPageState extends State<GameSettingsPage> {
     });
   }
 
-  void _incrementCounter() {
-    setState(() {
-      _counter++;
-    });
-  }
-
   void _restore() async {
     final profile = await Settings.instance();
     await profile.restore();

src/ui/flutter_app/lib/widgets/home_drawer.dart

@@ -20,8 +20,6 @@ import 'dart:async';
 
 import 'package:animated_text_kit/animated_text_kit.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
-import 'package:sanmill/common/config.dart';
 import 'package:sanmill/generated/l10n.dart';
 import 'package:sanmill/style/app_theme.dart';
 import 'package:sanmill/widgets/game_settings_page.dart';
@@ -180,6 +178,7 @@ class _HomeDrawerState extends State<HomeDrawer> {
       ),
     );
 
+    /*
     var exitListTile = ListTile(
       title: Text(
         S.of(context).exit,
@@ -202,13 +201,16 @@ class _HomeDrawerState extends State<HomeDrawer> {
         await SystemChannels.platform.invokeMethod<void>('SystemNavigator.pop');
       },
     );
+    */
 
+    /*
     var drawFooter = Column(
       children: <Widget>[
         exitListTile,
         SizedBox(height: MediaQuery.of(context).padding.bottom)
       ],
     );
+    */
 
     var scaffold = Scaffold(
       backgroundColor: AppTheme.drawerBackgroundColor,