From f9ce0427e8f26f453528493165e140f7ea96c924 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lubo=C5=A1=20Lu=C5=88=C3=A1k?= <l.lunak@kde.org>
Date: Mon, 5 May 2008 11:58:53 +0000
Subject: [PATCH] Do not activate the effect with nothing to show.

svn path=/trunk/KDE/kdebase/workspace/; revision=804228
---
 effects/presentwindows.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/effects/presentwindows.cpp b/effects/presentwindows.cpp
index 0969a4f44b..3947238896 100644
--- a/effects/presentwindows.cpp
+++ b/effects/presentwindows.cpp
@@ -304,8 +304,6 @@ void PresentWindowsEffect::setActive(bool active)
     if( mActivated )
         {
         mWindowData.clear();
-        effectActivated();
-        mActiveness = 0;
         windowFilter.clear();
         mWindowsToPresent.clear();
         const EffectWindowList& originalwindowlist = effects->stackingOrder();
@@ -320,6 +318,13 @@ void PresentWindowsEffect::setActive(bool active)
                 continue;
             mWindowsToPresent.append(window);
             }
+        if( mWindowsToPresent.isEmpty())
+            {
+            mActivated = false; // don't activate with nothing to show
+            return;
+            }
+        mActiveness = 0;
+        effectActivated();
         rearrangeWindows();
         setHighlightedWindow( effects->activeWindow());
         }