If the event corresponding to the read-up-to mark hasn't been loaded into the timeline window, we can't simply scroll to it. Instead, reload the timeline, centered on the RM event. Fixes https://github.com/vector-im/vector-web/issues/1055
If the event corresponding to the read-up-to mark hasn't been loaded into the timeline window, we can't simply scroll to it. Instead, reload the timeline, centered on the RM event. Fixes https://github.com/vector-im/vector-web/issues/1055