fdo#80902: Document grid type is not rendered properly

XML difference :
In document.xml
Original :
  <w:docGrid w:type="lines" w:linePitch="360"/>
Roundtrip :
  <w:docGrid w:type="default" w:linePitch="360" w:charSpace="0"/>

Document grid type is not set properly while import.

Change-Id: I68ec778c3138b37ad96f69942361a73ed0e85d71

sw/qa/extras/ooxmlexport/ooxmlexport.cxx

@@ -3420,6 +3420,16 @@ DECLARE_OOXMLEXPORT_TEST(testFdo80997, "fdo80997.docx")
     uno::Reference< text::XTextRange > xText = getRun( xParagraph, 1, " text");
 }
 
+DECLARE_OOXMLEXPORT_TEST(testFdo80902, "fdo80902.docx")
+{
+    // The problem was that the docGrid type was set as default so fix it for other grid type
+    xmlDocPtr pXmlDoc = parseExport("word/document.xml");
+    if (!pXmlDoc)
+       return;
+
+    assertXPath(pXmlDoc, "/w:document/w:body/w:sectPr/w:docGrid", "type", "lines");
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

writerfilter/source/dmapper/DomainMapper.cxx

@@ -896,7 +896,21 @@ void DomainMapper::lcl_attribute(Id nName, Value & val)
         {
             if (pSectionContext != NULL)
             {
-                pSectionContext->SetGridType(nIntValue);
+                switch( nIntValue )
+                {
+                    case NS_ooxml::LN_Value_wordprocessingml_ST_DocGrid_default:
+                    case NS_ooxml::LN_Value_wordprocessingml_ST_DocGrid_snapToChars:
+                        pSectionContext->SetGridType( 0 );
+                        break;
+                    case NS_ooxml::LN_Value_wordprocessingml_ST_DocGrid_lines:
+                        pSectionContext->SetGridType( 1 );
+                        break;
+                    case NS_ooxml::LN_Value_wordprocessingml_ST_DocGrid_linesAndChars:
+                        pSectionContext->SetGridType( 2 );
+                        break;
+                    default :
+                        OSL_FAIL("unknown SwTextGrid value");
+                }
             }
         }
         break;

writerfilter/source/dmapper/PropertyMap.cxx

@@ -1049,6 +1049,10 @@ void SectionPropertyMap::CloseSectionGroup( DomainMapper_Impl& rDM_Impl )
         operator[](PROP_GRID_LINES) =
                 uno::makeAny( static_cast<sal_Int16>(nTextAreaHeight/nGridLinePitch));
 
+        // PROP_GRID_MODE
+        operator[]( PROP_GRID_MODE) =
+                uno::makeAny( static_cast<sal_Int16> (m_nGridType) );
+
         sal_Int32 nCharWidth = 423; //240 twip/ 12 pt
         //todo: is '0' the right index here?
         const StyleSheetEntryPtr pEntry = rDM_Impl.GetStyleSheetTable()->FindStyleSheetByISTD(OUString::number(0, 16));