Description:

When threads were introduced, we played around with it a bit and disabled it. I had two unread comments in a thread, but after disabling threads the unread counter for the channel was gone. Many releases later, suddenly there was an unread counter for a channel despite the fact that I had read all messages in the channel. Some experimenting later it turned out that when I re-enabled threading, the thread icon had a two unread messages marker. However, since we also have pruning enabled, the old messages were gone, and could not be read, so I am stuck with a "2" badge on the channel that I cannot get rid of.

Steps to reproduce:

1. enable threading
2. have unread messages in a thread
3. disable threading
4. wait until after pruning.

Expected behavior

Unread badges disappear along with pruned messges/threads.

Actual behavior

Unread badges are kept after pruning and cannot be removed as the messages/threads no longer exists.

• Version of Rocket.Chat Server: 3.5.0

• Operating System: linux 3.16.0-10-amd64

• Deployment Method: docker

• Number of Running Instances: 2

• DB Replicaset Oplog: enabled

• NodeJS Version: v12.16.1

• MongoDB Version: 4.0.16

• Desktop App or Browser Version: Any browser. Safari and firefox tested

• Operating System: Mac OS Catalina