Updatify / Flutter | Release notes

This hotfix release addresses the following issues:

• flutter/84212 - Upgrading to 2.2.1 cause main.dart to crash
• flutter/83213 - TextFormField not responding to inputs on Android when typing on Microsoft SwiftKey
• flutter/82838 - Flutter Web failing to compile with “Undetermined Nullability”
• flutter/82874 - PopupMenuButton is broken after upgrade to Flutter 2.2.