message: encrypt for invited users if history visibility allows.
  fixes requires equivalent branch in js-sdk
diff: @@ -44,7 +44,7 @@ export function markAllDevicesKnown(matrixClient, devices) {
  * module:crypto~DeviceInfo|DeviceInfo}.
  */
  export function getUnknownDevicesForRoom(matrixClient, room) {
  - const roomMembers = room.getJoinedMembers().map((m) => {
  + const roomMembers = room.getEncryptionTargetMembers().map((m) => {
  return m.userId;
  });
  return matrixClient.downloadKeys(roomMembers, false).then((devices) => {
  