migrate flutter3.0

lib/data/provider/apt.dart

@@ -92,17 +92,20 @@ class AptProvider extends BusyProvider {
   Future<String> _update() async {
     switch (dist) {
       case Distribution.rehl:
-        return await client!.run(_wrap('yum check-update')).string;
+        return await client?.run(_wrap('yum check-update')).string ?? '';
       default:
         final session = await client!.execute(_wrap('apt update'));
         session.stderr.listen((event) => _onPwd(event, session.stdin));
         session.stdout.listen((event) {
           updateLog = (updateLog ?? '') + event.string;
           notifyListeners();
-          onUpdate!();
+          onUpdate ?? () {}();
         });
         await session.done;
-        return await client!.run('apt list --upgradeable'.withLangExport).string;
+        return await client
+                ?.run('apt list --upgradeable'.withLangExport)
+                .string ??
+            '';
     }
   }
 
@@ -151,7 +154,7 @@ class AptProvider extends BusyProvider {
       if (pwd.isEmpty) {
         logger.info('sudo password request cancelled');
       }
-      stdin.add(Uint8List.fromList(utf8.encode(pwd + '\n')));
+      stdin.add(Uint8List.fromList(utf8.encode('$pwd\n')));
     }
   }
 

lib/data/provider/debug.dart

@@ -34,8 +34,8 @@ class DebugProvider extends ChangeNotifier {
       ),
     );
     _addWidget(SingleChildScrollView(
-      child: widget,
       scrollDirection: Axis.horizontal,
+      child: widget,
     ));
   }
 

lib/data/provider/docker.dart

@@ -31,7 +31,6 @@ class DockerProvider extends BusyProvider {
     }
 
     final verRaw = await client!.run('docker version'.withLangExport).string;
-    print(verRaw);
     if (verRaw.contains(dockerNotFound)) {
       error = 'docker not found';
       notifyListeners();

lib/data/provider/server.dart

@@ -182,7 +182,7 @@ class ServerProvider extends BusyProvider {
             .run("echo '$shellCmd' > $shellPath && chmod +x $shellPath");
       } catch (e) {
         _servers[idx].connectionState = ServerConnectionState.failed;
-        _servers[idx].status.failedInfo = e.toString() + ' ## ';
+        _servers[idx].status.failedInfo = '$e ## ';
         logger.warning(e);
       } finally {
         notifyListeners();
@@ -264,9 +264,7 @@ class ServerProvider extends BusyProvider {
       }
       idx++;
     }
-    return (int.parse(value.split('\n')[idx].trim()) / 1000)
-            .toStringAsFixed(1) +
-        '°C';
+    return '${(int.parse(value.split('\n')[idx].trim()) / 1000).toStringAsFixed(1)}°C';
   }
 
   void _getCPU(