From 2f02157a0fc387b85058881a0668cffe748d2ad6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <mgraesslin@kde.org>
Date: Thu, 7 Feb 2013 12:18:17 +0100
Subject: [PATCH] Do not activate InvertEffect per window if there is no active
 window

BUG: 314593
FIXED-IN: 4.10.1
REVIEW: 108828
---
 effects/invert/invert.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/effects/invert/invert.cpp b/effects/invert/invert.cpp
index 04b6475e2d..a2075b0702 100644
--- a/effects/invert/invert.cpp
+++ b/effects/invert/invert.cpp
@@ -146,6 +146,9 @@ void InvertEffect::toggleScreenInversion()
 
 void InvertEffect::toggleWindow()
 {
+    if (!effects->activeWindow()) {
+        return;
+    }
     if (!m_windows.contains(effects->activeWindow()))
         m_windows.append(effects->activeWindow());
     else