Merge #12427: Make signrawtransaction accept P2SH-P2WSH redeemscripts

5f605e1 Make signrawtransaction accept P2SH-P2WSH redeemscripts (Pieter Wuille)

Pull request description:

  This is a quick fix for #12418, which is a regression in 0.16.

  It permits specifying just the inner redeemscript to let `signrawtransaction` succeed. This inner redeemscript is already reported by `addmultisigaddress` & co.

  #11708 uses a different approach, where `listunspent` reports both inner & outer redeemscript, but requires both to be provided to `signrawtransaction`. Part of #11708 is still needed even in combination with this PR however, as currently the inner redeemscript isn't reported by `listunspent`.

Tree-SHA512: a6fa2b2661ce04db25cf029dd31da39c0b4811d43692f816dfe0f77b4159b5e2952051664356a579f690ccd58a626e0975708afcd7ad5919366c490944e3a9a5

src/rpc/rawtransaction.cpp

@@ -848,6 +848,8 @@ UniValue signrawtransaction(const JSONRPCRequest& request)
                     std::vector<unsigned char> rsData(ParseHexV(v, "redeemScript"));
                     CScript redeemScript(rsData.begin(), rsData.end());
                     tempKeystore.AddCScript(redeemScript);
+                    // Automatically also add the P2WSH wrapped version of the script (to deal with P2SH-P2WSH).
+                    tempKeystore.AddCScript(GetScriptForWitness(redeemScript));
                 }
             }
         }