tdf#115212 DOCX export: fix ToC with tracked deletion

Removing part of Table of Contents with tracked deletion
resulted broken DOCX export, ie. unrecoverable and
uneditable document in MSO.

Change-Id: If5972b2c9fb967819b7be889e0a3efb3714e670b
Reviewed-on: https://gerrit.libreoffice.org/73550
Tested-by: Jenkins
Reviewed-by: László Németh <nemeth@numbertext.org>

sw/qa/extras/ooxmlexport/ooxmlexport11.cxx

@@ -862,6 +862,13 @@ DECLARE_OOXMLEXPORT_EXPORTONLY_TEST(testTdf70234, "tdf70234.docx")
     assertXPath(pXmlDoc, "/w:document/w:body/w:p[1]/w:del/w:r/w:delInstrText");
 }
 
+DECLARE_OOXMLEXPORT_EXPORTONLY_TEST(testTdf115212, "tdf115212.docx")
+{
+    xmlDocPtr pXmlDoc = parseExport("word/document.xml");
+    // export field with tracked deletion
+    assertXPath(pXmlDoc, "//w:p[2]/w:del[1]/w:r[1]/w:fldChar");
+}
+
 DECLARE_OOXMLEXPORT_TEST(testTdf118691, "tdf118691.docx")
 {
     uno::Reference<text::XTextTablesSupplier> xTablesSupplier(mxComponent, uno::UNO_QUERY);

sw/source/filter/ww8/docxattributeoutput.cxx

@@ -1390,7 +1390,9 @@ void DocxAttributeOutput::EndRun(const SwTextNode* pNode, sal_Int32 nPos, bool /
         // Add the fields starts for hyperlinks, TOCs and index marks
         if ( pIt->bOpen && !pIt->pField )
         {
+            StartRedline( m_pRedlineData );
             StartField_Impl( pNode, nPos, *pIt, true );
+            EndRedline( m_pRedlineData );
 
             if (m_startedHyperlink)
                 ++m_nFieldsInHyperlink;