fdo#76316 : File gets corrupt after Roundtrip

Issue :
	DOCX containing nested Hyperlinks, have mismatch xml tags.
	End tag for outer Hyperlinks does not get closed.

Implementation :
	1] Added code at Export side to maintain Count of
	   Hyperlinks started and ended.
	   Added check endParagraph() to to close Hyperlink tag
	   if not yet closed but started.
	2] Written Export Unit Test case.
NOTE : Corruption was occurring on "Without debug-util" build and Crash was occurring on "WITH debug-util build".

Reviewed on:
	https://gerrit.libreoffice.org/8654

Change-Id: I9a0ab48578f3d5f4a13c615f4e42a69e790d3ced

sw/qa/extras/ooxmlexport/ooxmlexport.cxx

@@ -2865,6 +2865,19 @@ DECLARE_OOXMLEXPORT_TEST(test76108, "test76108.docx")
     assertXPath(pXmlDoc, "/w:document[1]/w:body[1]/w:p[1]/w:r[1]/w:fldChar[1]", "fldCharType", "begin");
 }
 
+DECLARE_OOXMLEXPORT_TEST(testHyperLinkTagEnded, "fdo76316.docx")
+{
+    /* XML tag <w:hyperlink> was not getting closed when its inside another
+     * <w:hyperlink> tag.
+     */
+    xmlDocPtr pXmlDoc = parseExport("word/document.xml");
+
+    if (!pXmlDoc) return;
+
+    CPPUNIT_ASSERT(pXmlDoc);
+    assertXPath(pXmlDoc, "/w:document[1]/w:body[1]/w:tbl[1]/w:tr[2]/w:tc[1]/w:tbl[1]/w:tr[1]/w:tc[1]/w:tbl[1]/w:tr[7]/w:tc[1]/w:tbl[1]/w:tr[2]/w:tc[6]/w:tbl[1]/w:tr[1]/w:tc[1]/w:p[1]/w:hyperlink[1]/w:hyperlink[1]",1);
+}
+
 DECLARE_OOXMLEXPORT_TEST(testSimpleSdts, "simple-sdts.docx")
 {
     xmlDocPtr pXmlDoc = parseExport("word/document.xml");

sw/source/filter/ww8/docxattributeoutput.cxx

@@ -359,6 +359,16 @@ void DocxAttributeOutput::EndParagraph( ww8::WW8TableNodeInfoInner::Pointer_t pT
 
     --m_nTextFrameLevel;
 
+    /* If m_nHyperLinkCount > 0 that means hyperlink tag is not yet colsed.
+     * This is due to nested hyperlink tags. So close it before end of paragraph.
+     */
+    if(m_nHyperLinkCount > 0)
+    {
+        for(sal_Int32 nHyperLinkToClose = 0; nHyperLinkToClose < m_nHyperLinkCount; ++nHyperLinkToClose)
+            m_pSerializer->endElementNS( XML_w, XML_hyperlink );
+        m_nHyperLinkCount = 0;
+    }
+
     m_pSerializer->endElementNS( XML_w, XML_p );
 
     WriteParagraphSdt();
@@ -712,6 +722,7 @@ void DocxAttributeOutput::EndRun()
         {
             m_pSerializer->endElementNS( XML_w, XML_hyperlink );
             m_startedHyperlink = false;
+            m_nHyperLinkCount--;
         }
         m_closeHyperlinkInPreviousRun = false;
     }
@@ -743,6 +754,7 @@ void DocxAttributeOutput::EndRun()
         m_pSerializer->startElementNS( XML_w, XML_hyperlink, xAttrList );
         m_pHyperlinkAttrList = NULL;
         m_startedHyperlink = true;
+        m_nHyperLinkCount++;
     }
 
     // if there is some redlining in the document, output it
@@ -830,6 +842,7 @@ void DocxAttributeOutput::EndRun()
 
             m_pSerializer->endElementNS( XML_w, XML_hyperlink );
             m_startedHyperlink = false;
+            m_nHyperLinkCount--;
         }
         m_closeHyperlinkInThisRun = false;
     }
@@ -7060,6 +7073,7 @@ DocxAttributeOutput::DocxAttributeOutput( DocxExport &rExport, FSHelperPtr pSeri
       m_closeHyperlinkInThisRun( false ),
       m_closeHyperlinkInPreviousRun( false ),
       m_startedHyperlink( false ),
+      m_nHyperLinkCount(0),
       m_postponedGraphic( NULL ),
       m_postponedDiagram( NULL ),
       m_postponedVMLDrawing(NULL),

sw/source/filter/ww8/docxattributeoutput.hxx

@@ -771,6 +771,8 @@ private:
     bool m_closeHyperlinkInThisRun;
     bool m_closeHyperlinkInPreviousRun;
     bool m_startedHyperlink;
+    // Count nested HyperLinks
+    sal_Int32 m_nHyperLinkCount;
 
     struct PostponedGraphic
     {