Update block height of entry

updateentry.cpp

// ... somewhere ...
static int getHeight(const uint256& hash)
{
    CTransaction tx; 
    uint256 hashBlock = 0;
    if (!GetTransaction(hash, tx, hashBlock, true))
        return -1; // not found!
 
    if (hashBlock != 0) {
        std::map<uint256, CBlockIndex*>::const_iterator mi = mapBlockIndex.find(hashBlock);
        if (mi != mapBlockIndex.end() && (*mi).second) {
            CBlockIndex* pindex = (*mi).second;
            if (chainActive.Contains(pindex))
                return pindex->nHeight; // confirmed! SUCCESS!
        }
    }

    {
        LOCK(mempool.cs);
        if (!mempool.exists(hash))
            return -1; // conflicting!
    }
 
    return 0; // still unconfirmed
}

void TXHistoryDialog::UpdateHistory()
{
    // ...

    // loop over txHistoryMap and update the confirmations icon for each transaction
    for (HistoryMap::iterator it = txHistoryMap.begin(); it != txHistoryMap.end(); ++it) {        
        const uint256& txid = it->first;    // grab txid
        HistoryTXObject& htxo = it->second; // grab the transaction <- no copy, but reference (!)

        // might be confirmed now
        if (htxo.blockHeight == 0)
            htxo.blockHeight = getHeight(txid);

        // conflicting or orphaned
        if (htxo.blockHeight < 0)
            htxo.valid = false;

        int confirmations = 0;
        if (htxo.blockHeight > 0)
            confirmations = (chainHeight + 1) - htxo.blockHeight;

        // setup the appropriate icon
        // ...
    }
}