Thread includes messages from main timeline

[andybalaam]

Steps to reproduce

1. Chatting in a room
2. One participant started a thread based on one of the messages
3. More chatting

Outcome

What did you expect?

Only messages sent to the thread should be included in the thread.

What happened instead?

Messages from before the thread were included:

The thread started with Travis' "slight bump" message, but messages from before that are visible in the thread.

Operating system

Ubuntu 21.10

Browser information

Firefox 98.0.2

URL for webapp

https://develop.element.io

Application version

Element version: f029b68-react-d09205122d14-js-4360ae7ff817 Olm version: 3.2.8

Homeserver

matrix.org

Will you send logs?

Yes

[Stebalien]

I ran into this issue once, but it disappeared after I restarted Element. In case it's relevant, the thread started with a reply to a message in another thread.

I.e.:

1. Message A:
   1. Threaded: Message B
   2. Threaded: Message C
2. Message D, reply to C.
   1. Message E

[novocaine]

I believe this hasn't been seen for a while so assume fixed

[t3chguy]

Saw this just now

[t3chguy]

I had this happen again during development, and it made React devtools very unhappy. From what I could tell, the main timeline things are actually glitched/duplicated by React itself, they don't exist in the shadow DOM under the right panel