doc: Add testmempoolaccept to release-notes

doc/release-notes.md

@@ -74,6 +74,7 @@ RPC changes
   add `label` fields to returned JSON objects that previously only had
   `account` fields.
 - `sendmany` now shuffles outputs to improve privacy, so any previously expected behavior with regards to output ordering can no longer be relied upon.
+- The new RPC `testmempoolaccept` can be used to test acceptance of a transaction to the mempool without adding it.
 
 External wallet files
 ---------------------

src/rpc/rawtransaction.cpp

@@ -1198,7 +1198,7 @@ UniValue testmempoolaccept(const JSONRPCRequest& request)
     {
         LOCK(cs_main);
         test_accept_res = AcceptToMemoryPool(mempool, state, std::move(tx), &missing_inputs,
-            nullptr /* plTxnReplaced */, false /* bypass_limits */, max_raw_tx_fee, /* test_accpet */ true);
+            nullptr /* plTxnReplaced */, false /* bypass_limits */, max_raw_tx_fee, /* test_accept */ true);
     }
     result_0.pushKV("allowed", test_accept_res);
     if (!test_accept_res) {

src/validation.cpp

@@ -507,7 +507,7 @@ void UpdateMempoolForReorg(DisconnectedBlockTransactions &disconnectpool, bool f
 
 // Used to avoid mempool polluting consensus critical paths if CCoinsViewMempool
 // were somehow broken and returning the wrong scriptPubKeys
-static bool CheckInputsFromMempoolAndCache(const CTransaction& tx, CValidationState &state, const CCoinsViewCache &view, CTxMemPool& pool,
+static bool CheckInputsFromMempoolAndCache(const CTransaction& tx, CValidationState& state, const CCoinsViewCache& view, const CTxMemPool& pool,
                  unsigned int flags, bool cacheSigStore, PrecomputedTransactionData& txdata) {
     AssertLockHeld(cs_main);
 
@@ -917,8 +917,7 @@ static bool AcceptToMemoryPoolWorker(const CChainParams& chainparams, CTxMemPool
         // invalid blocks (using TestBlockValidity), however allowing such
         // transactions into the mempool can be exploited as a DoS attack.
         unsigned int currentBlockScriptVerifyFlags = GetBlockScriptFlags(chainActive.Tip(), Params().GetConsensus());
-        if (!CheckInputsFromMempoolAndCache(tx, state, view, pool, currentBlockScriptVerifyFlags, true, txdata))
-        {
+        if (!CheckInputsFromMempoolAndCache(tx, state, view, pool, currentBlockScriptVerifyFlags, true, txdata)) {
             // If we're using promiscuousmempoolflags, we may hit this normally
             // Check if current block has some flags that scriptVerifyFlags
             // does not before printing an ominous warning