if (window->priv->fullscreen_timeout_source) {
g_source_destroy (window->priv->fullscreen_timeout_source);
window->priv->fullscreen_timeout_source = NULL;
if (window->priv->fullscreen_timeout_source) {
g_source_destroy (window->priv->fullscreen_timeout_source);
window->priv->fullscreen_timeout_source = NULL;