Eliminating nullOk Parameters

Material Chip button semantics

SnackBars managed by the ScaffoldMessenger

TextSelectionTheme migration

Transition of platform channel test interfaces to flutter_test package

Use maxLengthEnforcement instead of maxLengthEnforced

Released in Flutter 1.22

Android v1 embedding app and plugin creation deprecation

Cupertino icons 1.0.0

The new Form, FormField auto-validation API

Released in Flutter 1.20

Actions API revision

Adding TextInputClient.currentAutofillScope property

New Buttons and Button Themes

Dialogs’ Default BorderRadius

More Strict Assertions in the Navigator and the Hero Controller Scope

The Route Transition record and Transition delegate updates