From fd3fc0b34a891751e6a0849421e8cecd19481324 Mon Sep 17 00:00:00 2001
From: Jiang Jiang <jiang.jiang@nokia.com>
Date: Mon, 6 Dec 2010 15:55:22 +0100
Subject: Fix crash in QTextDocument::markContentsDirty

6f6c25b6 introduced this regression because it didn't check d->lout
before calling d->lout->documentChange().

Task-number: QTBUG-15777
Reviewed-by: Eskil
---
 src/gui/text/qtextdocument.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/gui/text/qtextdocument.cpp b/src/gui/text/qtextdocument.cpp
index c35069f..77e6aa1 100644
--- a/src/gui/text/qtextdocument.cpp
+++ b/src/gui/text/qtextdocument.cpp
@@ -596,8 +596,10 @@ void QTextDocument::markContentsDirty(int from, int length)
     Q_D(QTextDocument);
     d->documentChange(from, length);
     if (!d->inContentsChange) {
-        d->lout->documentChanged(d->docChangeFrom, d->docChangeOldLength, d->docChangeLength);
-        d->docChangeFrom = -1;
+        if (d->lout) {
+            d->lout->documentChanged(d->docChangeFrom, d->docChangeOldLength, d->docChangeLength);
+            d->docChangeFrom = -1;
+        }
     }
 }
 
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