Code folding on build() methods doesn't show folding sections when using optional new and const

Steps to Reproduce

Open that code in Android Studio

    Container(
      child: Column(
        children: [
          Row(
            children: [Text("")],
          ),
          Row(
            children: [Text("")],
          ),
          Row(
            children: [Text("")],
          ),
        ],
      ),
    );

You can NOT see collapse / expand buttons at the left. Then add “new” words everywhere. You can DO see collapse / expand buttons at the left.

    new Container(
      child: new Column(
        children: [
          new Row(
            children: [Text("")],
          ),
          new Row(
            children: [Text("")],
          ),
          new Row(
            children: [Text("")],
          ),
        ],
      ),
    );

Expected behavior

See collapse / expand buttons in both the cases (with and without “new” words)

Version info

[✓] Flutter (Channel master, v0.5.5-pre.5, on Mac OS X 10.13.3 17D102, locale ru-RU)
    • Flutter version 0.5.5-pre.5 at /Users/pavel/Development/flutter
    • Framework revision d1aaa406ac (2 days ago), 2018-06-12 11:04:49 +0200
    • Engine revision d33bbff470
    • Dart version 2.0.0-dev.60.0.flutter-a5e41681e5

[✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
    • Android SDK at /Users/pavel/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-27, build-tools 27.0.3
    • 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-1024-b01)
    • All Android licenses accepted.

[!] iOS toolchain - develop for iOS devices (Xcode 9.2)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 9.2, Build version 9C40b
    ✗ libimobiledevice and ideviceinstaller are not installed. To install, run:
        brew install --HEAD libimobiledevice
        brew install ideviceinstaller
    ✗ ios-deploy not installed. To install:
        brew install ios-deploy
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without resolving iOS dependencies with CocoaPods, plugins will not work on iOS.
        For more info, see https://flutter.io/platform-plugins
      To install:
        brew install cocoapods
        pod setup

[✓] Android Studio (version 3.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 25.0.1
    • Dart plugin version 173.4700
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)

[!] IntelliJ IDEA Community Edition (version 2017.3.4)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.io/intellij-setup/#installing-the-plugins

[✓] Connected devices (1 available)
    • SM N920C • 83f0464f54334432 • android-arm64 • Android 6.0.1 (API 23)

! Doctor found issues in 2 categories.

[alexander-doroshko]

@FrenzyNwoba, Android Studio 3.1.4 is extremely outdated. You’ll get this folding feature as well as tons of other features and bugfixes if you update to the most recent Android Studio or IntelliJ IDEA version.

[MilkBiscuit]

Please fix this ASAP, this code folding feature for DART is a must have for me…