Widget property sometimes fail to show its dartdoc when hovering over it

[InMatrix]

Steps to Reproduce

The widget property won't display its dartdoc sometimes, when I hover over a widget property name in the detail pane of the inspector in Android Studio.

Version info

[✓] Flutter (Channel master, v0.5.4-pre.5, on Mac OS X 10.13.4 17E202, locale en-US)
• Flutter version 0.5.4-pre.5 at /Users/taodong/Code/flutter_repos/flutter
• Framework revision 3019ad976d (71 minutes ago), 2018-06-11 11:31:25 -0700
• Engine revision d33bbff470
• Dart version 2.0.0-dev.60.0.flutter-a5e41681e5

[✓] Android toolchain - develop for Android devices (Android SDK 27.0.0)
• Android SDK at /Users/taodong/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-27, build-tools 27.0.0
• 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 9.3.1)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 9.3.1, Build version 9E501
• ios-deploy 1.9.2
• CocoaPods version 1.5.2

[✓] 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)

[!] VS Code (version 1.23.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension not installed; install from
https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected devices (1 available)
• iPhone 6s • 713F5DD5-D1A0-46ED-976D-3D1487DBCFC6 • ios • iOS 11.3 (simulator)