Hot reload on web, native fidelity, and deeper integrations

Highlights

  • Hot reload on the web (Experimental).
  • New Expansible widget that makes it easier to create widgets that expand and collapse.
  • Many Material and Cupertino additions.
  • Several accessibility improvements.
  • Progress on multi-window support.
  • Desktop thread merging.
  • New Flutter Property Editor for IDEs.

Dart update here: https://kbin.earth/m/[email protected]/t/1358229