ui: add fix for GTK Pause key handling on Win32

Versions of GTK prior to 3.22 did not correctly set the keyval
field when VK_PAUSE was received on Windows.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
Message-id: 20180117164717.15855-4-berrange@redhat.com
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

ui/gtk.c

@@ -1206,7 +1206,14 @@ static gboolean gd_key_event(GtkWidget *widget, GdkEventKey *key, void *opaque)
         return TRUE;
     }
 
-    if (key->keyval == GDK_KEY_Pause) {
+    if (key->keyval == GDK_KEY_Pause
+#ifdef G_OS_WIN32
+        /* for some reason GDK does not fill keyval for VK_PAUSE
+         * See https://bugzilla.gnome.org/show_bug.cgi?id=769214
+         */
+        || key->hardware_keycode == VK_PAUSE
+#endif
+        ) {
         qemu_input_event_send_key_qcode(vc->gfx.dcl.con, Q_KEY_CODE_PAUSE,
                                         key->type == GDK_KEY_PRESS);
         return TRUE;