File qt-gui-4.8.1-fix-calligra-crash.patch of Package qt

commit cac12f4592477d99ef6fffaad40345bf85ef53b5
Author: Jiang Jiang <jiang.jiang@nokia.com>
Date:   Mon Apr 2 12:32:05 2012 +0200

Fix a crash in cursorToX() when new block is added
    
    When an empty new block is being added, the layoutData->memory data
    will be 0, thus QTextEngine::attributes() will return 0. We should
    only access the attributes pointer when some text actually exist.
    
    Task-number: QTBUG-24718
    Change-Id: I9ce9f7b57bccf24099a02832ce30fb6cebfaad33

diff --git a/src/gui/text/qtextlayout.cpp b/src/gui/text/qtextlayout.cpp
index ee658d9..16f7150 100644
--- a/src/gui/text/qtextlayout.cpp
+++ b/src/gui/text/qtextlayout.cpp
@@ -2508,6 +2508,10 @@ qreal QTextLine::cursorToX(int *cursorPos, Edge edge) const
     int pos = *cursorPos;
     int itm;
     const HB_CharAttributes *attributes = eng->attributes();
+    if (!attributes) {
+        *cursorPos = 0;
+        return x.toReal();
+    }
     while (pos < line.from + line.length && !attributes[pos].charStop)
         pos++;
     if (pos == line.from + (int)line.length) {