qt: Remove network detection based on address in BIP21

This is some very ugly and brittle code that switches the global network
based on a provided address, remove it. I think in practice it's very
unlikely for testnet BIP21 payment URIs to be used, and if so it's for
testing so it's easy enough to manually copy it. Or to specify
`-testnet` explicitly.

There is already no case for `-regtest` or `-signet`.

2 files changed, 2 insertions, 23 deletions

diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index d6f80e1558..c6b884e40a 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -587,7 +587,7 @@ int GuiMain(int argc, char* argv[])
         return EXIT_FAILURE;
     }
 #ifdef ENABLE_WALLET
-    // Parse URIs on command line -- this can affect Params()
+    // Parse URIs on command line
     PaymentServer::ipcParseCommandLine(argc, argv);
 #endif
 
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index cb09035b45..c82f0683fc 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -78,32 +78,11 @@ void PaymentServer::ipcParseCommandLine(int argc, char* argv[])
     for (int i = 1; i < argc; i++)
     {
         QString arg(argv[i]);
-        if (arg.startsWith("-"))
-            continue;
+        if (arg.startsWith("-")) continue;
 
-        // If the bitcoin: URI contains a payment request, we are not able to detect the
-        // network as that would require fetching and parsing the payment request.
-        // That means clicking such an URI which contains a testnet payment request
-        // will start a mainnet instance and throw a "wrong network" error.
         if (arg.startsWith(BITCOIN_IPC_PREFIX, Qt::CaseInsensitive)) // bitcoin: URI
         {
-            if (savedPaymentRequests.contains(arg)) continue;
             savedPaymentRequests.insert(arg);
-
-            SendCoinsRecipient r;
-            if (GUIUtil::parseBitcoinURI(arg, &r) && !r.address.isEmpty())
-            {
-                auto tempChainParams = CreateChainParams(gArgs, CBaseChainParams::MAIN);
-
-                if (IsValidDestinationString(r.address.toStdString(), *tempChainParams)) {
-                    SelectParams(CBaseChainParams::MAIN);
-                } else {
-                    tempChainParams = CreateChainParams(gArgs, CBaseChainParams::TESTNET);
-                    if (IsValidDestinationString(r.address.toStdString(), *tempChainParams)) {
-                        SelectParams(CBaseChainParams::TESTNET);
-                    }
-                }
-            }
         }
     }
 }