Version 2.21.6
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       * Initial support for XDMCP IndirectQuery choosers.
       * Also fix broken gdm_address_is_local.
       * Initial session migration/switching support.
       * Set CK session-type to LoginWindow for greeter session.
       * Add gdmflexiserver command for backward compatibility.
       * Add CK/PK system restart/stop functionality.

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