SelectCoinsMinConf: Prefer coins with fewer ancestors

src/txmempool.h

@@ -595,6 +595,9 @@ public:
     /** Expire all transaction (and their dependencies) in the mempool older than time. Return the number of removed transactions. */
     int Expire(int64_t time);
 
+    /** Returns false if the transaction is in the mempool and not within the chain limit specified. */
+    bool TransactionWithinChainLimit(const uint256& txid, size_t chainLimit) const;
+
     unsigned long size()
     {
         LOCK(cs);