Implementation in Flutter

I've implemented this in Flutter!

[GitHub](https://github.com/juskek/flutter_canvasnest)
[Flutter Package](https://pub.dev/packages/flutter_canvasnest)
[Demo](https://canvasnest-41664.web.app/#/)

I would appreciate a link in the related projects:

[flutter_canvasnest](https://github.com/juskek/flutter_canvasnest): Implementation in Flutter