title: Flutter dart debugger breakpoints stopped working
body: <p>I'm learning Dart and Flutter and developing a small Android Flutter app under Android Studio 3.1.2. Suddenly debugger breakpoints stopped working - the app started in debug mode never stops on them, and the red dots indicating breakpoints change to red dots with x inside. The only place in my app where they still work is in the main.dart module.</p>
  <p>I cleaned the project many times, tested on two different devices, uninstalled completely my Flutter debug app, and started new - nothing helps. Flutter update on beta (current beta 2) channel does nothing. Also tried switching to dev and master channels - no help.</p>
  <p>Did anyone encounter a similar situation, how do deal with it?</p>
  <p>Edit, adding mail.dart and output of flutter doctor (currently on the master branch, but have the same problem after switching to beta or dev branches):</p>
  <p>Imports from main.dart, or better all of main.dart:</p>
  <pre><code>import 'package:flutter/material.dart';
  import 'package:flutter_localizations/flutter_localizations.dart';
  
  import 'app_strings.dart';
  import 'net_libs_page/net_libs_page.dart';
  
  void main() =&gt; runApp(new MyApp());
  
  class MyApp extends StatelessWidget {
    // This widget is the root of your application.
    @override
    Widget build(BuildContext context) {
      return MaterialApp(
        localizationsDelegates: [
          // ... app-specific localization delegate[s] here
          AppLocalizationsDelegate(),
          GlobalMaterialLocalizations.delegate,
          GlobalWidgetsLocalizations.delegate,
          //FallbackMaterialLocalisationsDelegate(),
        ],
        supportedLocales: [
          Locale('en', 'US'), // English
          Locale('es', 'ES'), // Spanish
          Locale('pl', 'PL'),
          // ... other locales the app supports
        ],
        title: '@Voice Network Library', //_strings.title,
        theme: ThemeData(
          // This is the theme of your application.
          //
          // Try running your application with &quot;flutter run&quot;. You'll see the
          // application has a blue toolbar. Then, without quitting the app, try
          // changing the primarySwatch below to Colors.green and then invoke
          // &quot;hot reload&quot; (press &quot;r&quot; in the console where you ran &quot;flutter run&quot;,
          // or press Run &gt; Flutter Hot Reload in IntelliJ). Notice that the
          // counter didn't reset back to zero; the application is not restarted.
          primarySwatch: Colors.indigo,
        ),
        home: NetLibsPage(),
      );
    }
  }
  </code></pre>
  <p>Flutter doctor output:</p>
  <pre><code>Doctor summary (to see all details, run flutter doctor -v):
  [√] Flutter (Channel master, v0.4.5-pre.52, on Microsoft Windows [Version 10.0.16299.431], locale en-US)
  [√] Android toolchain - develop for Android devices (Android SDK 27.0.3)
  [√] Android Studio (version 3.1)
  [!] IntelliJ IDEA Ultimate Edition (version 2018.1)
      X Flutter plugin not installed; this adds Flutter specific functionality.
      X Dart plugin not installed; this adds Dart specific functionality.
  [!] VS Code, 32-bit edition (version 1.19.3)
  [√] Connected devices (1 available)
  
  ! Doctor found issues in 2 categories.
  </code></pre>