GetExternalSigner(): fail if multiple signers are found

If there are multiple external signers, `GetExternalSigner()` will
just pick the first one in the list. If the user has two or more
hardware wallets connected at the same time, he might not notice this.

This PR adds a check and fails with suitable message.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/qt/walletcontroller.cpp b/src/qt/walletcontroller.cpp
index d27ddf1aba..fae4c7cdf1 100644
--- a/src/qt/walletcontroller.cpp
+++ b/src/qt/walletcontroller.cpp
@@ -293,6 +293,10 @@ void CreateWalletActivity::create()
     } catch (const std::runtime_error& e) {
         QMessageBox::critical(nullptr, tr("Can't list signers"), e.what());
     }
+    if (signers.size() > 1) {
+        QMessageBox::critical(nullptr, tr("Too many external signers found"), QString::fromStdString("More than one external signer found. Please connect only one at a time."));
+        signers.clear();
+    }
     m_create_wallet_dialog->setSigners(signers);
 
     m_create_wallet_dialog->setWindowModality(Qt::ApplicationModal);