From e8664f83b9643b85f55a9eb28b7cd4c2cd15b4e5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Fl=C3=B6ser?= <mgraesslin@kde.org>
Date: Wed, 20 Sep 2017 19:32:54 +0200
Subject: [PATCH] Only call xcb_flush in performCompositing if we have an X11
 connection

Summary: Otherwise KWin crashes when operating without XWayland support.

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D7892
---
 composite.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/composite.cpp b/composite.cpp
index 767f0850db..ca984004ac 100644
--- a/composite.cpp
+++ b/composite.cpp
@@ -709,7 +709,9 @@ void Compositor::performCompositing()
 
     if (damaged.count() > 0) {
         m_scene->triggerFence();
-        xcb_flush(connection());
+        if (auto c = kwinApp()->x11Connection()) {
+            xcb_flush(c);
+        }
     }
 
     // Move elevated windows to the top of the stacking order