fs.patch

diff --git a/src/main.c b/src/main.c
index b992097..cfba7f5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -165,13 +165,13 @@ static void full_screen_activated(GSimpleAction *action, GVariant *parameter,
 
 	app = GTK_APPLICATION(user_data);
 	window = GTK_WINDOW(gtk_application_get_active_window(app));
+	GdkWindow *gdk_window = gtk_widget_get_window(GTK_WIDGET(window));
+	com.is_fullscreen = gdk_window_get_state (gdk_window) & GDK_WINDOW_STATE_FULLSCREEN;
 
 	if (com.is_fullscreen) {
 		gtk_window_unfullscreen(window);
-		com.is_fullscreen = FALSE;
 	} else {
 		gtk_window_fullscreen(window);
-		com.is_fullscreen = TRUE;
 	}
 }