From 402254b5752fcf6a8197b92f558cb0c35289fa74 Mon Sep 17 00:00:00 2001
From: martin <martin.sandsmark@kde.org>
Date: Wed, 25 May 2016 22:19:17 +0200
Subject: [PATCH] Flush xcb connection after opening fullscreen window (#74)

We need to ensure that the window handle is valid, i. e. the window is
actually created and accessible, before returning.

This is necessary because we immediately fork after returning, and the
child process opens its own X11 connection and expects the window handle
to be valid.

Fixes #46
---
 xcb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xcb.c b/xcb.c
index f1a9a76..3e8cd07 100644
--- a/xcb.c
+++ b/xcb.c
@@ -10,6 +10,7 @@
 #include <xcb/xcb.h>
 #include <xcb/xcb_image.h>
 #include <xcb/xcb_atom.h>
+#include <xcb/xcb_aux.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
@@ -150,6 +151,9 @@ xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, c
     values[0] = XCB_STACK_MODE_ABOVE;
     xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
 
+    /* Ensure that the window is created and set up before returning */
+    xcb_aux_sync(conn);
+
     return win;
 }