From 4e043026725b1dfd201bf432bdd0b28ba8867196 Mon Sep 17 00:00:00 2001
From: Friedemann Kleint <Friedemann.Kleint@digia.com>
Date: Thu, 22 Aug 2013 10:06:33 +0200
Subject: Check for window handle in QBackingStore::flush().

Task-number: QTBUG-33062

Change-Id: Iab4ccc3a2a855ee7f6964659b53b3401af436212
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
---
 src/gui/painting/qbackingstore.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/gui/painting/qbackingstore.cpp')

diff --git a/src/gui/painting/qbackingstore.cpp b/src/gui/painting/qbackingstore.cpp
index edb5f66c5b..c1f7c6c738 100644
--- a/src/gui/painting/qbackingstore.cpp
+++ b/src/gui/painting/qbackingstore.cpp
@@ -97,6 +97,11 @@ void QBackingStore::flush(const QRegion &region, QWindow *win, const QPoint &off
 {
     if (!win)
         win = window();
+    if (!win->handle()) {
+        qWarning() << "QBackingStore::flush() called for "
+            << win << " which does not have a handle.";
+        return;
+    }
 
 #ifdef QBACKINGSTORE_DEBUG
     if (win && win->isTopLevel() && !qt_window_private(win)->receivedExpose) {
-- 
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