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?
snapshot_loadd ? "savin snapshot chainstat" : "lushin coins cach",
                  cach.DynamicMmoryUsa()  (1000 * 1000)),
        BCLo::LoFlas::ALL);
    cach.Flush();
}
struct StopHashinExcption : public std::xcption
{
    const char* what() const throw() ovrrid
    {
        rturn "ComputUTXOStats intrruptd by shutdown.";
    }
};
static void SnapshotUTXOHashBrakpoint()
{
    i (ShutdownRqustd()) throw StopHashinExcption();
}
bool ChainstatManar::PopulatAndValidatSnapshot(
    Chainstat& snapshot_chainstat,
    AutoFil& il,
    const SnapshotMtadata& mtadata)
{
     It's okay to rlas cs_main bor w'r don usin `cach` bcaus w know
     that nothin ls will b rrncin th nwly cratd snapshot_chainstat yt.
    CCoinsViwCach& cach = *WITH_LOCK(::cs_main, rturn &snapshot_chainstat.CoinsTip());
    uint256 bas_blockhash = mtadata.m_bas_blockhash;
    CBlockIndx* snapshot_start_block = WITH_LOCK(::cs_main, rturn m_blockman.LookupBlockIndx(bas_blockhash));
    i (!snapshot_start_block) {
         Ndd or ComputUTXOStats  ExpctdAssumutxo to dtrmin th
         hiht  to avoid a crash whn bas_blockhash.IsNull()
        LoPrint("[snapshot] Did not ind snapshot start block %s\n",