From bcf76c0d2f057a65867df0abba7eece8457ec2ff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <mgraesslin@kde.org>
Date: Thu, 12 Nov 2015 17:14:36 +0100
Subject: [PATCH] [libkwinglutils] Fix regression in OpenGL version parsing

QByteArray seems to not like a truncate or left with -1.

Reviewed-By: Rohan Garg
---
 libkwineffects/kwinglutils.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libkwineffects/kwinglutils.cpp b/libkwineffects/kwinglutils.cpp
index ac1ceb6263..21885a5d59 100644
--- a/libkwineffects/kwinglutils.cpp
+++ b/libkwineffects/kwinglutils.cpp
@@ -112,7 +112,10 @@ void initGL(OpenGLPlatformInterface platformInterface)
     if (glversionstring.startsWith("OpenGL ES ")) {
         glversionstring = glversionstring.mid(10);
     }
-    glversionstring.truncate(glversionstring.indexOf(' '));
+    const int whiteSpaceIndex = glversionstring.indexOf(' ');
+    if (whiteSpaceIndex != -1) {
+        glversionstring.truncate(whiteSpaceIndex);
+    }
     auto glversioninfo = glversionstring.split('.');
     while (glversioninfo.count() < 3)
         glversioninfo << "0";