gui: Add thread to run background activity in WalletController

src/qt/walletcontroller.cpp

@@ -26,11 +26,17 @@ WalletController::WalletController(interfaces::Node& node, const PlatformStyle*
     for (std::unique_ptr<interfaces::Wallet>& wallet : m_node.getWallets()) {
         getOrCreateWallet(std::move(wallet));
     }
+
+    m_activity_thread.start();
 }
 
 // Not using the default destructor because not all member types definitions are
 // available in the header, just forward declared.
-WalletController::~WalletController() {}
+WalletController::~WalletController()
+{
+    m_activity_thread.quit();
+    m_activity_thread.wait();
+}
 
 std::vector<WalletModel*> WalletController::getWallets() const
 {

src/qt/walletcontroller.h

@@ -13,6 +13,7 @@
 #include <vector>
 
 #include <QMutex>
+#include <QThread>
 
 class OptionsModel;
 class PlatformStyle;
@@ -51,6 +52,7 @@ Q_SIGNALS:
     void coinsSent(WalletModel* wallet_model, SendCoinsRecipient recipient, QByteArray transaction);
 
 private:
+    QThread m_activity_thread;
     interfaces::Node& m_node;
     const PlatformStyle* const m_platform_style;
     OptionsModel* const m_options_model;