Document that text field owners must keep track of their controllers #14104
Description
Steps to Reproduce
When a Material field is scrolled off screen, and loses focus the field will be reset to it's initialValue. See this screen movie for a demo:
Logs
Analyzing /Users/arno/AndroidStudioProjects/qlouder_expenses...
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Flutter Doctor
[✓] Flutter (on Mac OS X 10.13.2 17C205, locale en-NL, channel alpha)
• Flutter at /Users/arno/flutter
• Framework revision 8f65fec5f5 (5 weeks ago), 2017-12-12 09:50:14 -0800
• Engine revision edaecdc8b8
• Tools Dart version 1.25.0-dev.11.0
• Engine Dart version 2.0.0-edge.d8ae797298c3a6cf8dc9f4558707bd2672224d3e
[✓] Android toolchain - develop for Android devices (Android SDK 27.0.1)
• Android SDK at /Users/arno/Library/Android/sdk
• Android NDK at /Users/arno/Library/Android/sdk/ndk-bundle
• Platform android-27, build-tools 27.0.1
• 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-915-b08)
[✓] iOS toolchain - develop for iOS devices (Xcode 9.2)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 9.2, Build version 9C40b
• ios-deploy 1.9.2
• CocoaPods version 1.4.0.beta.2
[✓] Android Studio (version 3.0)
• Android Studio at /Applications/Android Studio.app/Contents
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-915-b08)
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Important issues not at the top of the work listEntering text in a text field or keyboard related problemsA detailed proposal for a change to FlutterIssues with https://api.flutter.dev/flutter/packages/flutter repository. See also f: labels.Owned by Text Input teamTriaged by Text Input team