qt: Add SynchronizationState enum to signal parameter

src/qt/bitcoin.cpp

@@ -34,6 +34,7 @@
 #include <uint256.h>
 #include <util/system.h>
 #include <util/threadnames.h>
+#include <validation.h>
 
 #include <memory>
 
@@ -61,6 +62,7 @@ Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin);
 // Declare meta types used for QMetaObject::invokeMethod
 Q_DECLARE_METATYPE(bool*)
 Q_DECLARE_METATYPE(CAmount)
+Q_DECLARE_METATYPE(SynchronizationState)
 Q_DECLARE_METATYPE(uint256)
 
 static QString GetLangTerritory()
@@ -435,6 +437,7 @@ int GuiMain(int argc, char* argv[])
 
     // Register meta types used for QMetaObject::invokeMethod and Qt::QueuedConnection
     qRegisterMetaType<bool*>();
+    qRegisterMetaType<SynchronizationState>();
 #ifdef ENABLE_WALLET
     qRegisterMetaType<WalletModel*>();
 #endif