Resolves: crash on export of ooo47778-3.sxw to docx

This is a horror where the table in the frame has its cells out
of visual sequence, so the last row appears before the last node
so on hitting the last node we have to really jump backwards to
a previously skipped set of nodes to find the end of the table

Change-Id: I93545e0c425267647d5f048c3bd95fe0cfddf8f3
(cherry picked from commit 89a28f54)

sw/qa/extras/ooxmlexport/ooxmlexport5.cxx

@@ -813,6 +813,12 @@ DECLARE_OOXMLEXPORT_TEST(testSectionHeader, "sectionprot.odt")
     }
 }
 
+DECLARE_OOXMLEXPORT_TEST(testOO47778, "ooo47778-3.odt")
+{
+    if (xmlDocPtr pXmlDoc = parseExport("word/document.xml"))
+        assertXPathContent(pXmlDoc, "(//w:t)[3]", "c");
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

sw/source/filter/ww8/wrtww8.cxx

@@ -2531,11 +2531,51 @@ void WW8Export::SectionBreaksAndFrames( const SwTextNode& rNode )
         OutWW6FlyFrmsInContent( rNode );
 }
 
+class TrackContentToExport
+{
+private:
+    SwPaM *m_pCurPam;
+    SwPaM m_aOrigPam;
+public:
+    TrackContentToExport(SwPaM *pCurPam)
+        : m_pCurPam(pCurPam)
+        , m_aOrigPam(*pCurPam, NULL)
+    {
+    }
+
+    bool contentRemainsToExport(ww8::WW8TableInfo *pTableInfo)
+    {
+        bool bSimpleContentRemains = m_pCurPam->GetPoint()->nNode < m_pCurPam->GetMark()->nNode ||
+            (m_pCurPam->GetPoint()->nNode == m_pCurPam->GetMark()->nNode &&
+              m_pCurPam->GetPoint()->nContent.GetIndex() <= m_pCurPam->GetMark()->nContent.GetIndex());
+        if (bSimpleContentRemains)
+            return true;
+
+        if (!pTableInfo)
+            return false;
+
+        //An old-school table where one cell may points back to a previous node as the next cell
+        //so if this node is the last node in the range, we may need to jump back to a previously
+        //skipped cell to output it in a sane sequence. See ooo47778-3.sxw for one of these
+        //horrors. So if we are at the end of the selection, but this end point is a table
+        //cell whose next cell is in the selection allow jumping back to it
+        const SwNode* pCurrentNode = &m_pCurPam->GetPoint()->nNode.GetNode();
+        const SwNode* pNextNode = pTableInfo->getNextNode(pCurrentNode);
+
+        if (pNextNode && pCurrentNode != pNextNode)
+        {
+            return pNextNode->GetIndex() >= m_aOrigPam.GetPoint()->nNode.GetIndex() &&
+                   pNextNode->GetIndex() < m_aOrigPam.GetMark()->nNode.GetIndex();
+        }
+
+        return false;
+    }
+};
+
 void MSWordExportBase::WriteText()
 {
-    while( m_pCurPam->GetPoint()->nNode < m_pCurPam->GetMark()->nNode ||
-           ( m_pCurPam->GetPoint()->nNode == m_pCurPam->GetMark()->nNode &&
-             m_pCurPam->GetPoint()->nContent.GetIndex() <= m_pCurPam->GetMark()->nContent.GetIndex() ) )
+    TrackContentToExport aContentTracking(m_pCurPam);
+    while (aContentTracking.contentRemainsToExport(m_pTableInfo.get()))
     {
         SwNode& rNd = m_pCurPam->GetNode();