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Description
Description
This is follow-up on #34026 .
In Keycloak 27 upgrade, we may be able to remove the support for the KEYCLOAK_SESSION cookie in the old format (format like realm/user/sessionId) and remove the related code from AuthenticationManager and login-status-iframe as we don't need to be compatible with the old format anymore. See the commit related to #34026 on more details on what can be removed.
This can be done in Keycloak 27 (not earlier).
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