Partial: Fix off-by-one errors in use of IsFinalTx()

Conflicts:
	src/main.cpp
	src/miner.cpp
	src/qt/transactiondesc.cpp
	src/qt/transactionrecord.cpp

Rebased-from: 3f25f26edcc41b22130c5845024b86a9b1aa6183 0.8.x

src/qt/transactiondesc.cpp

@@ -16,10 +16,10 @@
 
 QString TransactionDesc::FormatTxStatus(const CWalletTx& wtx)
 {
-    if (!wtx.IsFinal())
+    if (!wtx.IsFinal(nBestHeight + 1))
     {
         if (wtx.nLockTime < LOCKTIME_THRESHOLD)
-            return tr("Open for %n more block(s)", "", wtx.nLockTime - nBestHeight + 1);
+            return tr("Open for %n more block(s)", "", wtx.nLockTime - nBestHeight);
         else
             return tr("Open until %1").arg(GUIUtil::dateTimeStr(wtx.nLockTime));
     }

src/qt/transactionrecord.cpp

@@ -166,12 +166,12 @@ void TransactionRecord::updateStatus(const CWalletTx &wtx)
     status.depth = wtx.GetDepthInMainChain();
     status.cur_num_blocks = nBestHeight;
 
-    if (!wtx.IsFinal())
+    if (!wtx.IsFinal(nBestHeight + 1))
     {
         if (wtx.nLockTime < LOCKTIME_THRESHOLD)
         {
             status.status = TransactionStatus::OpenUntilBlock;
-            status.open_for = wtx.nLockTime - nBestHeight + 1;
+            status.open_for = wtx.nLockTime - nBestHeight;
         }
         else
         {