重要改动 (Breaking changes)
正如 重要改动策略 中描述的，我们会不定期地发布关于重要改动的迁移指南。
As described in the breaking change policy, on occasion we publish guides for migrating code across a breaking change.
以下是可用的迁移指南，它们按发行版本分类并按字母顺序排列。
The following guides are available. They are sorted by release, and listed in alphabetical order:
尚未发布稳定版
Not yet released to stable
回退改动
Reverted changes
以下重要改动已被回退。
The following breaking changes have been reverted.
iOS 端和 Android 端的网络策略
引入版本：2.0.0
回退版本：2.2.0（建议）
Network Policy on iOS and Android
Introduced in version: 2.0.0
Reverted in version: 2.2.0 (proposed)
发布于 Flutter 2.2
Released in Flutter 2.2
发布于 Flutter 2
Released in Flutter 2
-
为 TextEditingController.buildTextSpan 添加 BuildContext 参数
Added BuildContext parameter to TextEditingController.buildTextSpan
-
变更 Android 端 ActivityControlSurface attachToActivity 签名
Android ActivityControlSurface attachToActivity signature change
-
移除 Android 端 FlutterMain.setIsRunningInRobolectricTest 测试 API
Android FlutterMain.setIsRunningInRobolectricTest testing API removed
-
对 RenderBox 的 Dry 布局支持（译者注：Dry 即 Don’t repeat yourself，意思为不要重复自己）
-
平台通道测试向 flutter_test package 过渡
Transition of platform channel test interfaces to flutter_test package
发布于 Flutter 1.22
Released in Flutter 1.22
发布于 Flutter 1.20
Released in Flutter 1.20
-
在导航和 Hero Controller 范围内使用更加严格的断言
More Strict Assertions in the Navigator and the Hero Controller Scope
-
Reversing the dependency between the scheduler and services layer
-
TextInputClient 增加 showAutocorrectionPromptRect 方法
showAutocorrectionPromptRect method added to TextInputClient