fdo#78651 DOCX Incorrect export of nested Tables

As the m_oldTableReference->m_pOldTablepInner was not cleared
the same tabled was incorrectly nested with itself.

Another issue was that the same table was mirrored in RT file
as LO was trying to export a Section break within a table cell.

Conflicts:
	sw/qa/extras/ooxmlexport/ooxmlexport.cxx

Reviewe on:
	https://gerrit.libreoffice.org/9361

Change-Id: I09b730a10f1a0bc4434050e0078aeab3185de817

sw/qa/extras/ooxmlexport/ooxmlexport.cxx

@@ -3377,6 +3377,16 @@ DECLARE_OOXMLEXPORT_TEST(testfdo78300,"fdo78300.docx")
                 0);
 }
 
+DECLARE_OOXMLEXPORT_TEST(testFdo78651, "fdo78651.docx")
+{
+    xmlDocPtr pXmlDoc = parseExport("word/document.xml");
+
+    if (!pXmlDoc)
+        return;
+    // ensure that there are only two tables
+    assertXPath(pXmlDoc, "//w:tbl", 2);
+}
+
 #endif
 
 CPPUNIT_PLUGIN_IMPLEMENT();

sw/source/filter/ww8/docxattributeoutput.cxx

@@ -2553,6 +2553,7 @@ void DocxAttributeOutput::switchHeaderFooter(bool isHeaderFooter, sal_Int32 inde
             //Reset the oldReference, after copying it back to the original.
             m_oldTableReference->m_bTableCellOpen = false ;
             m_oldTableReference->m_nTableDepth = 0;
+            m_oldTableReference->m_pOldTablepInner.reset();
        }
 
     }

sw/source/filter/ww8/ww8atr.cxx

@@ -434,6 +434,13 @@ void MSWordExportBase::OutputSectionBreaks( const SfxItemSet *pSet, const SwNode
                 the RT files with different first page being set.
             */
             bNewPageDesc = false;
+
+            /*
+             * If Table cell is open and page header types are different
+             * set pSet to NULL as we don't want to add any section breaks.
+             */
+            if ( isCellOpen && ( pAktPageDesc->GetName() != pPageDesc->GetName() ) )
+                pSet = NULL;
         }
         else
         {