Timeline does not update even though sync is running

[bwindels]

Timeline stopped showing new incoming message. Clicking the room tile again (several times? can't remember) refreshed the timeline. Might have clicked the room tile quite a few times before and/or have scrolled up/filled gaps before this happened.

Confirmed sync was running with the devtools. No errors in the console.

Did something close the timeline (e.g. disposed the TimelineViewModel?) this is on bwindels/reconnect btw.

[bwindels]

I checked several code paths and couldn't think of a way that the timeline would get closed while still looking at it. Added some logging though to see if it happens.

• the timeline gets closed in SessionViewModel._openRoom when calling disposeTracked.
• we unsubscribe from the timeline when unmounting the ListView, but that should only happen when emitting a change of the currentRoom a bit later in that method.