matrix-js-sdk

d37fa810 - Timeline needs to refresh when we see a MSC2716 marker event

Timeline needs to refresh when we see a MSC2716 marker event > In a [sync meeting with @ara4n](https://docs.google.com/document/d/1KCEmpnGr4J-I8EeaVQ8QJZKBDu53ViI7V62y5BzfXr0/edit#bookmark=id.67nio1ka8znc), we came up with the idea to make the `marker` events as state events. When the client sees that the `m.room.marker` state changed to a different event ID, it can throw away all of the timeline and re-fetch as needed. > > For homeservers where the [same problem](https://github.com/matrix-org/matrix-doc/pull/2716#discussion_r782499674) can happen, we probably don't want to throw away the whole timeline but it can go up the `unsigned.replaces_state` chain of the `m.room.marker` state events to get them all. > > In terms of state performance, there could be thousands of `marker` events in a room but it's no different than room members joining and leaving over and over like an IRC room. > > *-- https://github.com/matrix-org/matrix-spec-proposals/pull/2716#discussion_r782629097*