export 'Chapter' field type as 'StyleRef' into .doc

Change-Id: I7e635c76b08636a9915cee30aaebb08fc854633d
Reviewed-on: https://gerrit.libreoffice.org/17888Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Andras Timar <andras.timar@collabora.com>

sw/source/filter/ww8/ww8atr.cxx

@@ -2879,7 +2879,11 @@ void AttributeOutputBase::TextField( const SwFormatField& rField )
             {
                 SwChapterField aCopy(*static_cast<const SwChapterField*>(pField));
                 aCopy.ChangeExpansion(*pTextNd, false);
-                WriteExpand( &aCopy );
+                const OUString sStr = FieldString(ww::eSTYLEREF)
+                    + " \"Heading "
+                    + OUString::number(aCopy.GetLevel() + 1)
+                    + "\"  \\* MERGEFORMAT ";
+                GetExport().OutputField(pField, ww::eSTYLEREF, sStr);
                 bWriteExpand = false;
             }
         }