Merge bitcoin-core/gui#840: qt6: Handle different signatures of QANEF::nativeEventFilter

80761af qt6: Handle different signatures of `QANEF::nativeEventFilter` (Hennadii Stepanov)

Pull request description:

  Split from bitcoin#30997.

  This PR ensures compatibility across all supported Qt versions.

  For more details, please refer to qt/qtbase@3b38c73.

  No behaviour change.

ACKs for top commit:
  maflcko:
    lgtm ACK 80761af
  promag:
    Code review ACK 80761af.

Tree-SHA512: a265e1c33cc7da37003bb0e6fd40950acb5e948ca9ec63a59a79c5e2a1894334f48d5565539c91d4d777b48a589366958df1498eaa6935e3b7fb534493adb51a

Author: hebasto

src/qt/winshutdownmonitor.cpp

@@ -12,7 +12,11 @@
 
 // If we don't want a message to be processed by Qt, return true and set result to
 // the value that the window procedure should return. Otherwise return false.
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+bool WinShutdownMonitor::nativeEventFilter(const QByteArray &eventType, void *pMessage, qintptr *pnResult)
+#else
 bool WinShutdownMonitor::nativeEventFilter(const QByteArray &eventType, void *pMessage, long *pnResult)
+#endif
 {
        Q_UNUSED(eventType);
 

src/qt/winshutdownmonitor.h

@@ -20,7 +20,11 @@ class WinShutdownMonitor : public QAbstractNativeEventFilter
     WinShutdownMonitor(std::function<void()> shutdown_fn) : m_shutdown_fn{std::move(shutdown_fn)} {}
 
     /** Implements QAbstractNativeEventFilter interface for processing Windows messages */
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    bool nativeEventFilter(const QByteArray &eventType, void *pMessage, qintptr *pnResult) override;
+#else
     bool nativeEventFilter(const QByteArray &eventType, void *pMessage, long *pnResult) override;
+#endif
 
     /** Register the reason for blocking shutdown on Windows to allow clean client exit */
     static void registerShutdownBlockReason(const QString& strReason, const HWND& mainWinId);