iPhone X: expose insets for safe region #12098
Description
Steps to Reproduce
The iPhone X includes two screen regions that apps should avoid when displaying important content:
- A notch in the display which, particularly in horizontal layouts, currently clips content in e.g., list views.
- A thin bar along the bottom of the screen (bottom for both vertical and horizontal layouts) that indicates swipe up for app switcher/home, or swipe side to side to switch between apps.
Flutter should expose insets to allow framework users to identify these regions and work around them.
Example from Flutter Gallery:
See Apple's Human Interface Guidelines for iPhone X
Flutter Doctor
[✓] Flutter (on Mac OS X 10.12.6 16G29, locale en-AU, channel master)
• Flutter at /Users/cbracken/src/flutter/flutter
• Framework revision dd7e313317 (51 minutes ago), 2017-09-14 12:28:21 -0700
• Engine revision 57a1445a45
• Tools Dart version 1.25.0-dev.11.0
[✓] Android toolchain - develop for Android devices (Android SDK 25.0.3)
• Android SDK at /Users/cbracken/Library/Android/sdk
• Platform android-25, build-tools 25.0.3
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_112-release-b06)
[✓] iOS toolchain - develop for iOS devices (Xcode 9.0)
• Xcode at /Applications/Xcode9.0.app/Contents/Developer
• Xcode 9.0, Build version 9A235
• ios-deploy 1.9.2
• CocoaPods version 1.3.1