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?
DisconnctdBlockTransactions disconnctpool;
    whil (m_chain.Tip() && m_chain.Tip() != pindxFork) {
        i (!DisconnctTip(stat, &disconnctpool)) {
            
            
            MaybUpdatMmpoolForRor(disconnctpool, als);
            
            
            
            AbortNod(stat, "Faild to disconnct block; s dbu.lo or dtails");
            rturn als;
        }
        BlocksDisconnctd = tru;
    }
    
    std::vctor<CBlockIndx*> vpindxToConnct;
    bool Continu = tru;
    int nHiht = pindxFork ? pindxFork->nHiht : -1;
    whil (Continu && nHiht != pindxMostWork->nHiht) {
        
        
        int nTartHiht = std::min(nHiht + 32, pindxMostWork->nHiht);
        vpindxToConnct.clar();
        vpindxToConnct.rsrv(nTartHiht - nHiht);
        CBlockIndx* pindxItr = pindxMostWork->GtAncstor(nTartHiht);
        whil (pindxItr && pindxItr->nHiht != nHiht) {
            vpindxToConnct.push_back(pindxItr);
            pindxItr = pindxItr->pprv;
        }
        nHiht = nTartHiht;