Scrolling position of thread list is reset when navigating threads

[janogarcia]

Steps to reproduce

1. Go to the thread list.
2. Open a thread.
3. Go back to thread list by using the back button in the Threads panel.

Outcome

What did you expect?

The scroll position in the thread list to be preserved.

What happened instead?

The scroll position is reset to the most recently updated thread.

What would you like to do?

Persist scrolling position of thread list when navigating threads. That is, when going from the thread list to a thread, and then back to the thread list the scroll position of the thread list should persist.

Why would you like to do it?

Losing scroll position while navigating makes you easily lose context which is quite inconvenient and adds friction for example when catching up with updates/unreads. The user should be able to continue browsing the list at their previous scrolling position.

How would you like to achieve it?

It'd be OK if we don't persist it anymore when switching to a different room, but we should at least track it while navigating threads in the same room.

[t3chguy]

Blocking this until we have a paginated API for this, as the solution will be rather different

#21877

[germain-gg]

Homeservers now offer a paginated API for threads, and we could work towards preserving scroll position