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Before these changes when max_sescmd_history was used the session was closed when the limit was exceeded. With this change, when the limit is exceeded the recovery of slaves and the session command history are both disabled. This will allow the sessions to continue while still keeping the old functionality of limited salve replacement. The disable_sescmd_history and disable_slave_recovery parameters were combined so that disabling the session command history will also disable slave recovery. This way no harm can be done with disable_sescmd_history.