Open matrixbot opened 6 months ago
This seems to be more of a protocol issue than a Synapse issue: the protocol simply doesn't specify a way for federated servers to be kept up to date with device-list changes for invited users.
We think this is low impact
This issue has been migrated from #3504.
If you invite a user to an E2E chat, you have no way of being told when its device list changes as it is not yet participating in the room. As a result, any added devices won't be encrypted for. Options to fix this include:
Related to https://github.com/matrix-org/synapse/issues/3503.
This has been split out from https://github.com/vector-im/riot-web/issues/2713#issuecomment-402989021.