fdo#76098 ContentType for .xlsm external data file is wrong

1. Open a File which has Pie Chart in LO.
2. The content type of Pie Chart should Macro Enabled.
3. using LO, SAVE this file.
4. Opened the Save file in MS-Office.
5. The file gets corrupted due to the ContentType gets changed.

Conflicts:
	sw/qa/extras/inc/swmodeltestbase.hxx
Reviewed on:
	https://gerrit.libreoffice.org/8572

Change-Id: I20f92f52cc79df4fc5e10c4e4867e2e704ba3c86

sw/qa/extras/inc/swmodeltestbase.hxx

@@ -552,6 +552,7 @@ protected:
         xmlXPathRegisterNs(pXmlXpathCtx, BAD_CAST("rels"), BAD_CAST("http://schemas.openxmlformats.org/package/2006/relationships"));
         xmlXPathRegisterNs(pXmlXpathCtx, BAD_CAST("w14"), BAD_CAST("http://schemas.microsoft.com/office/word/2010/wordml"));
         xmlXPathRegisterNs(pXmlXpathCtx, BAD_CAST("m"), BAD_CAST("http://schemas.openxmlformats.org/officeDocument/2006/math"));
+        xmlXPathRegisterNs(pXmlXpathCtx, BAD_CAST("ContentType"), BAD_CAST("http://schemas.openxmlformats.org/package/2006/content-types"));
         xmlXPathObjectPtr pXmlXpathObj = xmlXPathEvalExpression(BAD_CAST(rXPath.getStr()), pXmlXpathCtx);
         return pXmlXpathObj->nodesetval;
     }

sw/qa/extras/ooxmlexport/ooxmlexport.cxx

@@ -2813,6 +2813,18 @@ DECLARE_OOXMLEXPORT_TEST(testNestedAlternateContent, "nestedAlternateContent.doc
     assertXPath(pXmlDoc,"/w:document[1]/w:body[1]/w:p[1]/w:r[1]/mc:AlternateContent[1]/mc:Choice[1]/w:drawing[1]/wp:anchor[1]/a:graphic[1]/a:graphicData[1]/wpg:wgp[1]/wps:wsp[2]/wps:txbx[1]/w:txbxContent[1]/w:p[1]/w:r[2]/mc:AlternateContent[1]",0);
 }
 
+DECLARE_OOXMLEXPORT_TEST(testContentTypeXLSM, "fdo76098.docx")
+{
+    xmlDocPtr pXmlDoc = parseExport("[Content_Types].xml");
+
+    if (!pXmlDoc)
+       return;
+
+    assertXPath(pXmlDoc, "/ContentType:Types/ContentType:Override[2]", "ContentType", "application/vnd.ms-excel.sheet.macroEnabled.12");
+
+}
+
+
 #endif
 
 CPPUNIT_PLUGIN_IMPLEMENT();

sw/source/filter/ww8/docxexport.cxx

@@ -1213,10 +1213,15 @@ void DocxExport::WriteEmbeddings()
         OUString embeddingPath = embeddingsList[j].Name;
         uno::Reference<io::XInputStream> embeddingsStream;
         embeddingsList[j].Value >>= embeddingsStream;
+
+        OUString contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
+        if (embeddingPath.endsWith(OUString(".xlsm")))
+            contentType = "application/vnd.ms-excel.sheet.macroEnabled.12";
+
         if ( embeddingsStream.is() )
         {
             uno::Reference< io::XOutputStream > xOutStream = GetFilter().openFragmentStream(embeddingPath,
-                                    "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
+                                    contentType);
             try
             {
                 sal_Int32 nBufferSize = 512;