[Bug]Changes to items in FieldArray cause whole list of items to update

[jarekb84]

Are you submitting a bug report or a feature request?

Bug

What is the current behavior?

Changing a single item in a FieldArray causes whole list to be resorted. Inspecting actions and state diff using Redux dev tools shows an action dispatched where payload updates the correct item (via index key), but the difference in state includes changes to all items in the list.

What is the expected behavior?

Changing a single item only updates that item's state in the redux store.

Sandbox Link

Attempted to create sandbox with scenario, but there are issues with the current sandbox setup with 7.2.1
https://codesandbox.io/s/811pjkq2y9

What's your environment?

"redux-form": "7.2.1"
"redux": "^3.5.2"
"immutable": "^3.8.1"
"react-redux": "^5.0.1",
Chrome 63.0.3239.132
Node 8.9.1

Other information

Note this does not happen in version 7.0.4/7.1.2 and when number of items provided to FieldArray is less than 32.

[erikras]

Published fix in v7.2.2.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.