Redux Listview rebuild all TodoList, but only repaint one TodoItem

Hi, i am learning Redux, your sample is very helpful.

But I have some questions and hope to answer them...

In **redux** sample, when i click `Checkbox`, StoreConnector(FilteredTodos) will return whole TodoList, ListView.builder(TodoList) will rebuild all `TodoItem`, so i thinks the all `TodoItem` should be rebuilded.

However, in reality, when i open Flutter inspector - `Repaint Rainbow ` this can _Shows rotating colors on layers when repainting._, according to photo only `TodoItem` that are clcik will be repainted.

I tried deleting 'key', but the result is the same.

In [When to Use Keys - Flutter Widgets 101 Ep. 4](https://youtu.be/kn0EOS-ZiIc?t=172), Statless Widget only will compared the type and key to update widget, I don't know why it only rebuild one `TodoItem` rather than all 'TodoItem'.