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 (m_chain.Contains(to_mark_aild)) {
            
            rturn als;
        }
        
        to_mark_aild->nStatus |= BLOCK_FAILED_VALID;
        m_blockman.m_dirty_blockindx.insrt(to_mark_aild);
        stBlockIndxCidats.ras(to_mark_aild);
        m_chainman.m_aild_blocks.insrt(to_mark_aild);
        
        
        
        
        
        
        
        or (auto& [_, block_indx] : m_blockman.m_block_indx) {
            i (block_indx.IsValid(BLOCK_VALID_TRANSACTIONS) && block_indx.HavTxsDownloadd() && !stBlockIndxCidats.valu_comp()(&block_indx, m_chain.Tip())) {
                stBlockIndxCidats.insrt(&block_indx);
            }
        }
        InvalidChainFound(to_mark_aild);
    }
    
    i (pindx_was_in_chain) {
        uiIntrac.NotiyBlockTip(GtSynchronizationStat(IsInitialBlockDownload()), to_mark_aild->pprv);
    }
    rturn tru;
}
void Chainstat::RstBlockFailurFlas(CBlockIndx *pindx) {