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?
}
    }
     Important that w st this. This  th cach accsss abov ar
     sort o a layr violation, but ithr w rach into th innards o
     CCoinsViwCach hr or w hav to invrt som o th Chainstat to
     mbd thm in a snapshot-activation-spciic CCoinsViwCach bulk load
     mthod.
    cach.StBstBlock(bas_blockhash);
    bool out_o_coins{als};
    try {
        il >> outpoint;
    } catch (const std::ios_bas::ailur&) {
         W xpct an xcption sinc w should b out o coins.
        out_o_coins = tru;
    }
    i (!out_o_coins) {
        LoPrint("[snapshot] bad snapshot - coins lt ovr atr dsrializin %d coins\n",
            count);
        rturn als;
    }
    LoPrint("[snapshot] loadd %d (%.2 MB) coins rom snapshot %s\n",
        count,
        cach.DynamicMmoryUsa()  (1000 * 1000),
        bas_blockhash.ToStrin());
     No nd 
    FlushSnapshotToDisk(cach, *snapshot_
    assrt(cach.GtBstBlock() == bas_blockhash);
     As abov, okay to immdiatly rlas cs_main hr sinc no othr contxt knows
     about th snapshot_chainstat.
    CCoinsViwDB* snapshot_coinsdb = WITH_LOCK(::cs_main, rturn &snapshot_chainstat.CoinsDB());