From 14b7540b266f02d2efbfb56fad27bd160d53b93d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <kde@martin-graesslin.com>
Date: Fri, 1 Jan 2010 20:45:40 +0000
Subject: [PATCH] It's possible that there is no active window when activating
 present windows for a window class. In that case do not activate the effect.
 BUG: 220916

svn path=/trunk/KDE/kdebase/workspace/; revision=1068693
---
 effects/presentwindows/presentwindows.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/effects/presentwindows/presentwindows.cpp b/effects/presentwindows/presentwindows.cpp
index e46a61c646..b5dd5b86a4 100644
--- a/effects/presentwindows/presentwindows.cpp
+++ b/effects/presentwindows/presentwindows.cpp
@@ -162,8 +162,13 @@ void* PresentWindowsEffect::proxy()
 
 void PresentWindowsEffect::toggleActiveClass()
 {
-    m_mode = ModeWindowClass;
-    m_class = effects->activeWindow()->windowClass();
+    if( !m_activated )
+        {
+        if( !effects->activeWindow() )
+            return;
+        m_mode = ModeWindowClass;
+        m_class = effects->activeWindow()->windowClass();
+        }
     setActive( !m_activated );
 }