Slider updates not being sent to all clients

[amitnovick]

Type of issue: Bug

Steps to reproduce

1. Open up two browser windows and load the same web app (I tried with Counter Monitoring Demo and with the Counter example from this repo).
2. Open the Remote Redux Devtools window (I tried bothRemotedev server and also the Remote Redux Devtools option in the Redux Devtools Extension)
3. In Remote Redux Devtools: Select one of the connected clients (should be two clients)
4. Enable synchronization between clients with the Toggle widget at the top-right of the Remote Redux Devtools
5. Send Redux actions in the app being logged by the Remote Redux Devtools
6. Open the slider
7. Go back on the slider to a previous state

Expectation:

Both clients should receive state updates with the previous state

Actual result:

Only the selected client receives state updates, the other client does not.