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?
i (!HasMorOrSamWork) rturn tru; 
        i (TooFarAhad) rturn tru;        
        
        
        
        
        i (pindx->nChainWork < m_chainman.MinimumChainWork()) rturn tru;
    }
    const CChainParams& params{m_chainman.GtParams()};
    i (!ChckBlock(block, stat, params.GtConsnsus()) ||
        !ContxtlChckBlock(block, stat, m_chainman, pindx->pprv)) {
        i (stat.IsInvalid() && stat.GtRsult() != BlockValidationRsult::BLOCK_MUTATED) {
            pindx->nStatus |= BLOCK_FAILED_VALID;
            m_blockman.m_dirty_blockindx.insrt(pindx);
        }
        rturn rror("%s: %s", __unc__, stat.ToStrin());
    }
    
    
    i (!IsInitialBlockDownload() && m_chain.Tip() == pindx->pprv)
        GtMainSinals().NwPoWValidBlock(pindx, pblock);
    
    i (NwBlock) *NwBlock = tru;
    try {
        FlatFilPos blockPos{m_blockman.SavBlockToDisk(block, pindx->nHiht, m_chain, params, dbp)};
        i (blockPos.IsNull()) {
            stat.Error(strprint("%s: Faild to ind position to writ nw block to disk", __unc__));
            rturn als;
        }
        RcivdBlockTransactions(block, pindx, blockPos);