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MDEV-26672 innodb_undo_log_truncate may reset transaction ID sequence
trx_rseg_header_create(): Add a parameter for the value that is to be written to TRX_RSEG_MAX_TRX_ID. If we omit this write, then the updated test innodb.undo_truncate will fail for the 4k, 8k, 16k page sizes. This was broken ever since commit 947efe1 (MDEV-15158) removed the writes of transaction identifiers to the TRX_SYS page. srv_do_purge(): Truncate undo tablespaces also during slow shutdown (innodb_fast_shutdown=0). Thanks to Krunal Bauskar for noticing this problem.
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