fdo#79915:Text Data Lost after exporting through LO

In the OutputTextNode, the text data is postponed when the in case of
NOT_PROCESSED state of fly frame. This text data is never been processed
later.

When the text data is postponed we should write this before processing
the next text node.

Change-Id: Ib8d5fdcf8dcfb9ff394d32103502150e08bbd521
Reviewed-on: https://gerrit.libreoffice.org/9737Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>

sw/qa/extras/ooxmlexport/ooxmlexport.cxx

@@ -3617,6 +3617,15 @@ DECLARE_OOXMLEXPORT_TEST(testfdo79822, "fdo79822.docx")
         return;
 }
 
+DECLARE_OOXMLEXPORT_TEST(testFDO79915, "fdo79915.docx")
+{
+    xmlDocPtr pXmlDoc = parseExport("word/document.xml");
+    if (!pXmlDoc)
+        return;
+
+    assertXPathContent(pXmlDoc, "/w:document/w:body/w:p[2]/w:r[8]/w:t", "How much buoyancy does the water provide?");
+}
+
 DECLARE_OOXMLEXPORT_TEST(testfdo79817,"fdo79817.docx")
 {
     xmlDocPtr pXmlDoc = parseExport("word/document.xml");

sw/source/filter/ww8/wrtw8nds.cxx

@@ -2320,6 +2320,13 @@ void MSWordExportBase::OutputTextNode( const SwTxtNode& rNode )
             AttrOutput().RunText( aSavedSnippet, eChrSet );
             AttrOutput().EndRun();
         }
+        else if( bPostponeWritingText && FLY_NOT_PROCESSED == nStateOfFlyFrame )
+        {
+            //write the postponed text run
+            bPostponeWritingText = false ;
+            AttrOutput().RunText( aSavedSnippet, eChrSet );
+            AttrOutput().EndRun();
+        }
         else
             AttrOutput().EndRun();