timeline: Load previous events
This load older events when the user scrolles to close to the upper edge of the room-history.
Blocked by: https://github.com/matrix-org/matrix-rust-sdk/pull/288
Edited by Julian Sparber
This load older events when the user scrolles to close to the upper edge of the room-history.
Blocked by: https://github.com/matrix-org/matrix-rust-sdk/pull/288