print command is adding extra new lines to every output in the console for iOS

Steps to Reproduce

Extra new lines are added after every print statement in the console.

Code Sample

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      print("counter = $_counter");
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

Expected results

...
flutter: counter = 0
flutter: counter = 1
flutter: counter = 2
...

Actual results

Launching lib/main.dart on 6s in debug mode...
Automatically signing iOS for device deployment using specified development team in Xcode project: ***
Running Xcode build...
Xcode build done.                                           34.0s
Installing and launching...
Waiting for 6s to report its views...
Debug service listening on ws://localhost:60847/ws
Syncing files to device 6s...
flutter: counter = 0


flutter: counter = 1


flutter: counter = 2


flutter: counter = 3

...

Version info

flutter doctor output

[✓] Flutter (Channel stable, 1.20.0, on Mac OS X 10.15.5 19F101, locale en-IN)
    • Flutter version 1.20.0 at /Users/***/Library/flutter
    • Framework revision 840c9205b3 (33 hours ago), 2020-08-04 20:55:12 -0700
    • Engine revision c8e3b94853
    • Dart version 2.9.0


[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    • Android SDK at /Users/***/Library/Android/sdk
    • Platform android-28, build-tools 28.0.3
    • ANDROID_HOME = /Users/***/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.5)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.5, Build version 11E608c
    • CocoaPods version 1.9.3

[✓] Android Studio (version 3.4)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 37.1.1
    • Dart plugin version 183.6270
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)

[✓] IntelliJ IDEA Ultimate Edition (version 2020.1.3)
    • IntelliJ at /Applications/IntelliJ IDEA.app
    • Flutter plugin version 47.1.3
    • Dart plugin version 201.8538.45

[✓] IntelliJ IDEA Community Edition (version 2019.1.3)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 39.0.3
    • Dart plugin version 191.8580

[✓] VS Code (version 1.35.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.2.0

[✓] Connected device (2 available)
    • A0001 (mobile)     • ***                                 • android-arm • Android 6.0.1 (API 23)
    • 6s (mobile) • *** • ios         • iOS 13.5.1

• No issues found!

[animeshjain]

I tried it on a couple of iPhone devices. Another weird thing -

• It is happening on iPhone 6s with iOS 13.5.1
• It is not happening on iPhone 5s with iOS 12.4.8.

Also see this comment - https://github.com/flutter/flutter/issues/63082#issuecomment-669958023. It seems @TahaTesser was able to repro this as well (perhaps on iPhone 11 simulator with iOS 13.6, as per their flutter doctor)

[jacob314]

This has now been fixed.