+static void
+gtk_window_set_theme_variant (GtkWindow *window)
+{
+#ifdef GDK_WINDOWING_X11
+ GdkWindow *gdk_window;
+ gboolean dark_theme_requested;
+
+ g_object_get (gtk_settings_get_for_screen (window->priv->screen),
+ "gtk-application-prefer-dark-theme", &dark_theme_requested,
+ NULL);
+
+ gdk_window = gtk_widget_get_window (GTK_WIDGET (window));
+
+ if (GDK_IS_X11_WINDOW (gdk_window))
+ gdk_x11_window_set_theme_variant (gdk_window,
+ dark_theme_requested ? "dark" : NULL);
+#endif
+}
+
+static void
+gtk_window_on_theme_variant_changed (GtkSettings *settings,
+ GParamSpec *pspec,
+ GtkWindow *window)
+{
+ if (window->priv->type == GTK_WINDOW_TOPLEVEL)
+ gtk_window_set_theme_variant (window);
+}
+