ui/dbus: discard display messages on disable

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-ID: <20241008125028.1177932-7-marcandre.lureau@redhat.com>

ui/dbus-listener.c

@@ -107,6 +107,8 @@ static void dbus_scanout_disable(DisplayChangeListener *dcl)
 {
     DBusDisplayListener *ddl = container_of(dcl, DBusDisplayListener, dcl);
 
+    ddl_discard_display_messages(ddl);
+
     qemu_dbus_display1_listener_call_disable(
         ddl->proxy, G_DBUS_CALL_FLAGS_NONE, -1, NULL, NULL, NULL);
 }