QAbstractNativeEventFilter: Add a Windows example

Change-Id: Ic378174e7f192abc27524cbcd925705c8bb46502
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/doc/snippets/code/src_corelib_kernel_qabstractnativeeventfilter_win.cpp

@@ -0,0 +1,20 @@
+// Copyright (C) 2022 Laszlo Papp <lpapp@kde.org>
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+//! [0]
+class MyMSGEventFilter : public QAbstractNativeEventFilter
+{
+public:
+    bool nativeEventFilter(const QByteArray &eventType, void *message, qintptr *) override
+    {
+        if (eventType == "windows_generic_MSG") {
+            MSG *msg = static_cast<MSG *>(message);
+            // ...
+        } else if (eventType == "windows_dispatcher_MSG") {
+            MSG *msg = static_cast<MSG *>(message);
+            // ...
+        }
+        return false;
+    }
+};
+//! [0]

src/corelib/kernel/qabstractnativeeventfilter.cpp

@@ -69,6 +69,9 @@ QAbstractNativeEventFilter::~QAbstractNativeEventFilter()
     \b {Linux example}
     \snippet code/src_corelib_kernel_qabstractnativeeventfilter.cpp 0
 
+    \b {Windows example}
+    \snippet code/src_corelib_kernel_qabstractnativeeventfilter_win.cpp 0
+
     \b {macOS example}
 
     mycocoaeventfilter.h: