animated

Thanks a ton for any helpful feedback

I need help with getting best quality GIFs.

I am not used to CSS syntax so it would be amazing if you add a lot of example config.yml files. Also, try adding config.yml files for the GIFs you are displaying in your README.md. They look fantastic. I have spent hours trying to get perfect GIF but no luck.

I don't know what value to give for shadow

Environment

System:
    OS: macOS 10.15.2
    CPU: (4) x64 Intel(R) Core(TM) i5-7360U CPU @ 2.30GHz
    Memory: 270.89 MB / 8.00 GB
    Shell: 5.7.1 - /bin/zsh
  Binaries:
    Node: 13.5.0 - /usr/local/bin/node
    npm: 6.13.4 - /usr/local/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  SDKs:
    iOS SDK:
      Platforms: iOS 13.2, DriverKit 19.0, macOS 10.15, tvOS 13.

The sorting does not seem to be working when the items are in a fixed height container that scroll all the items.

See this fiddle:
https://jsfiddle.net/ns5jg8L9/

If you try to drag the last item in the list to the top it won't scroll automatically and even if you use the mouse wheel to scroll while dragging it, dropping it on the top won't trigger a drop.

I guess this has something to do

The diagnostics provieded in the debug console when an error occurs is not precise enough.
aserts in the constructor and debugFillProperties should be implemented for better diagnistocs.

Look at the AnimatedContainer widget source code for examples.