Issue: Input fields keep loosing focus about flutter_form_builder HOT 12 CLOSED

import 'package:flutter/material.dart';
import 'package:flutter_form_builder/flutter_form_builder.dart';

class ActivityPage extends StatelessWidget {
  final GlobalKey<FormBuilderState> _fbKey = GlobalKey();

  var data;

  final allCountries = [
    "Afghanistan",
    "Albania",
    "Algeria",
    "American Samoa",
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('New activity'),
      ),
      body: SingleChildScrollView(
        child: FormBuilder(context, key: _fbKey, controls: [
          FormBuilderInput.typeAhead(
            decoration: InputDecoration(labelText: "Country"),
            attribute: 'country',
            // require: true,
            itemBuilder: (context, country) {
              return ListTile(
                title: Text(country),
              );
            },
            suggestionsCallback: (query) {
              if (query.length != 0) {
                var lowercaseQuery = query.toLowerCase();
                return allCountries.where((country) {
                  return country.toLowerCase().contains(lowercaseQuery);
                }).toList(growable: false)
                  ..sort((a, b) => a.toLowerCase().indexOf(lowercaseQuery).compareTo(b.toLowerCase().indexOf(lowercaseQuery)));
              } else {
                return allCountries;
              }
            },
          ),
          FormBuilderInput.textField(
            type: FormBuilderInput.TYPE_TEXT,
            attribute: "name",
            decoration: InputDecoration(labelText: "Full Name"),
            value: "John Doe",
          ),
        ]),
      ),
    );
  }
}

C:\src\flutter\bin\flutter.bat doctor --verbose
[√] Flutter (Channel stable, v1.2.1, on Microsoft Windows [Version 10.0.17763.379], locale en-GB)
    • Flutter version 1.2.1 at C:\src\flutter
    • Framework revision 8661d8aecd (7 weeks ago), 2019-02-14 19:19:53 -0800
    • Engine revision 3757390fa4
    • Dart version 2.1.2 (build 2.1.2-dev.0.0 0a7dcf17eb)

[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    • Android SDK at C:\Users\bve\AppData\Local\Android\sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.3
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)
    • All Android licenses accepted.

[√] Android Studio (version 3.3)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 34.0.1
    • Dart plugin version 182.5215
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)

[!] VS Code (version 1.32.3)
    • VS Code at C:\Users\bve\AppData\Local\Programs\Microsoft VS Code
    X Flutter extension not installed; install from
      https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[√] Connected device (2 available)
    • Android SDK built for x86 • emulator-5554 • android-x86 • Android 9 (API 28) (emulator)
    • Android SDK built for x86 • emulator-5556 • android-x86 • Android 9 (API 28) (emulator)

! Doctor found issues in 1 category.