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bcf80eaa95
The logic to compute the page number was broken, and as a result, only the first page of multixact members was updated correctly. All the rest were left as zeros. Improve test_multixact.py to generate more multixacts, to cover this case. Also fix the check that the restored PG data directory matches the original one. Previously, the test compared the 'pg_new' cluster, which is a bit silly because the test restored the 'pg_new' cluster only a few lines earlier, so if the multixact WAL redo is somehow broken, the comparison will just compare two broken data directories and report success. Change it to compare the original datadir, the one where the multixacts were originally created, with a restored image of the same.