commit 2448112f318e3f7801c1354d54ef98c1588e0c06
Author: Reginald Kennedy <address@hidden>
Date:   Fri Aug 11 12:07:09 2017 +0800

    Fix Xlib accessor race condition with gtk >= 2.18
    see https://developer.gnome.org/gtk2/stable/gtk-migrating-ClientSideWindows.html

diff --git a/gtk/videowindow.c b/gtk/videowindow.c
index f7077041b..a2795f05c 100644
--- a/gtk/videowindow.c
+++ b/gtk/videowindow.c
@@ -103,6 +103,9 @@ static gboolean drag_drop(GtkWidget *widget, GdkDragContext *drag_context, gint
 
 static void *get_native_handle(GdkWindow *gdkw){
 #ifdef GDK_WINDOWING_X11
+#if GTK_CHECK_VERSION(2,18,0)
+	gdk_display_sync(gdk_window_get_display(gdkw));
+#endif
 	return (void *)GDK_WINDOW_XID(gdkw);
 #elif defined(_WIN32)
 	return (void *)GDK_WINDOW_HWND(gdkw);