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fixes:
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MariaDB allows an server to be a master and a slave simutaneously, so when
migrating masters, if the old master is reactivated before attaching the
other replicas to the new master, new unexpected GTIDs may be created on
the old master and synced to some of the other replicas by chance, as the
other replicas are still connecting to the old one by the time. After that
these diverged slave will fail changing to the new master. This will be
fixed by first attaching the other replicas to the new master, and then
dealing with old master.
Fixes #1754539
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