Network requests still occurring after changing the conversation in talk

[SystemKeeper]

To Reproduce Steps to reproduce the behavior:

1. Go to conversation A that contains a shared text file, enable editing
2. Observe that you see sync and push requests
3. Change to conversation B

Expected behavior You should not see any sync or push related requests anymore.

Actual behavior Requests from the first conversation/document are still observed

Seen on 30.0.0 on c.nc.c