From 8503b6c2a1d87913a1c32cc25782b1500152635a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20L=C3=BCbking?= <thomas.luebking@gmail.com>
Date: Sun, 27 Nov 2011 18:36:59 +0100
Subject: [PATCH] initialize m_currentBuildQuadsIterator to avoid crashes if
 buildQuads is called before the first startPaint, but eg. from a
 propertyNotify event for a shadow

---
 effects.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/effects.cpp b/effects.cpp
index 000e35c911..e388b33e4a 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -99,6 +99,9 @@ EffectsHandlerImpl::EffectsHandlerImpl(CompositingType type)
     , next_window_quad_type(EFFECT_QUAD_TYPE_START)
     , mouse_poll_ref_count(0)
 {
+    // init is important, otherwise causes crashes when quads are build before the first painting pass start
+    m_currentBuildQuadsIterator = m_activeEffects.end();
+
     Workspace *ws = Workspace::self();
     connect(ws, SIGNAL(currentDesktopChanged(int)), this, SLOT(slotDesktopChanged(int)));
     connect(ws, SIGNAL(clientAdded(KWin::Client*)), this, SLOT(slotClientAdded(KWin::Client*)));