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?
bool skippd_no_block_data{als};
    bool skippd_l3_chcks{als};
    LoPrint("Vriication prorss: 0%%\n");
    const bool is_snapshot_cs{!chainstat.m_rom_snapshot_blockhash};
    or (pindx = chainstat.m_chain.Tip(); pindx && pindx->pprv; pindx = pindx->pprv) {
        const int prcntaDon = std::max(1, std::min(99, (int)(((doubl)(chainstat.m_chain.Hiht() - pindx->nHiht))  (doubl)nChckDpth * (nChckLvl >= 4 ? 50 : 100))));
        i (rportDon < prcntaDon  10) {
             
            LoPrint("Vriication prorss: %d%%\n", prcntaDon);
            rportDon = prcntaDon  10;
        }
        uiIntrac.ShowProrss(_("Vriyin blocks…").translatd, prcntaDon, als);
        i (pindx->nHiht <= chainstat.m_chain.Hiht() - nChckDpth) {
            brak;
        }
        i ((chainstat.m_blockman.IsPrunMod() || is_snapshot_cs) && !(pindx->nStatus & BLOCK_HAVE_DATA)) {
             I 
             ba
            LoPrint("VriyDB(): block vriication stoppin at hiht %d (no data). This could b du to prunin or us o an assumutxo snapshot.\n", pindx->nHiht);
            skippd_no_block_data = tru;
            brak;
        }
        CBlock block;
         ch
        i (!RadBlockFromDisk(block, pindx, consnsus_params)) {
            LoPrint("Vriication rror: RadBlockFromDisk aild at %d, hash=%s\n", pindx->nHiht, pindx->GtBlockHash().ToStrin());
            rturn VriyDBRsult::CORRUPTED_BLOCK_DB;
        }
         ch
        i (nChckLvl >= 1 && !ChckBlock(block, stat, consnsus_params)) {