matrix-js-sdk

963e271b - Refuse to link live timelines into the forwards/backwards position

Refuse to link live timelines into the forwards/backwards position See https://github.com/vector-im/riot-web/issues/8593#issuecomment-478681816 Previously (https://github.com/matrix-org/matrix-js-sdk/pull/873) we allowed half-linking timelines to each other if they satisfy the conditions, however this appears to not be helping. Instead, it seems like the timelines are getting stuck in a position where one direction is spliced but the other is broken. To avoid this case, we'll just avoid splicing in both directions when one of the directions is invalid.