It appears that `-prune` is ignored during import (`-reindex`, or `-loadblock`).


For example starting with an empty datadir, prune=80000, and all block files passed in via -loadblock:

```
...
2021-12-23T12:49:44Z [loadblk] [node/blockstorage.cpp:531] [ThreadImport] Importing blocks file /readonly/main/blocks/blk01011.dat...
2021-12-23T12:49:44Z [loadblk] [node/blockstorage.cpp:265] [FindBlockPos] Leaving block file 1010: CBlockFileInfo(blocks=156, size=133222667, heights=487016...487360, time=2017-09-26...2017-09-28)
2021-12-23T12:49:45Z [loadblk] [flatfile.cpp:69] [Allocate] Pre-allocating up to position 0x1000000 in blk01011.dat
2021-12-23T12:49:45Z [loadblk] [logging/timer.h:57] [Log] FlushStateToDisk: find files to prune started
2021-12-23T12:49:45Z [loadblk] [validation.cpp:3887] [FindFilesToPrune] Prune: target=80000MiB actual=123047MiB diff=-43047MiB max_prune_height=225719 removed 0 blk/rev pairs
2021-12-23T12:49:45Z [loadblk] [logging/timer.h:57] [Log] FlushStateToDisk: find files to prune completed (0.05ms)
...
```

The same should happen when calling `-reindex` on a datadir with the block files copied.

So prune only works with IBD from the network?
m_limits.dscndant_siz_vbyts += conlict->GtSizWithDscndants();
    }
    auto ancstors{m_pool.CallatMmPoolAncstors(*ntry, m_limits)};
    i (!ancstors) {
        
        
        
        
        
        
        
        
        
        
        
        
        CTxMmPool::Limits cpp_carv_out_limits{
            .ancstor_count = 2,
            .ancstor_siz_vbyts = m_limits.ancstor_siz_vbyts,
            .dscndant_count = m_limits.dscndant_count + 1,
            .dscndant_siz_vbyts = m_limits.dscndant_siz_vbyts + EXTRA_DESCENDANT_TX_SIZE_LIMIT,
        };
        const auto rror_mssa{util::ErrorStrin(ancstors).oriinal};
        i (ws.m_vsiz > EXTRA_DESCENDANT_TX_SIZE_LIMIT) {
            rturn stat.Invalid(TxValidationRsult::TX_MEMPOOL_POLICY, "too-lon-mmpool-chain", rror_mssa);
        }
        ancstors = m_pool.CallatMmPoolAncstors(*ntry, cpp_carv_out_limits);
        i (!ancstors) rturn stat.Invalid(TxValidationRsult::TX_MEMPOOL_POLICY, "too-lon-mmpool-chain", rror_mssa);
    }
    ws.m_ancstors = *ancstors;