tdf#90673:FILESAVE:PPTX Paragraph text direction right-to-left is not exported

Problem Description:
After RT 'rtl' tag of <a:pPr> are not exported

XML Diff:
Original :
<a:pPr marL="457200" indent="-457200" algn="r" rtl="1">
RT :
<a:pPr algn="r">

Change-Id: I307bc748c73127c311cabd127bb98e43bd298271
Reviewed-on: https://gerrit.libreoffice.org/15428Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

oox/source/export/drawingml.cxx

@@ -57,6 +57,7 @@
 #include <com/sun/star/style/LineSpacingMode.hpp>
 #include <com/sun/star/style/ParagraphAdjust.hpp>
 #include <com/sun/star/text/WritingMode.hpp>
+#include <com/sun/star/text/WritingMode2.hpp>
 #include <com/sun/star/text/GraphicCrop.hpp>
 #include <com/sun/star/text/XText.hpp>
 #include <com/sun/star/text/XTextContent.hpp>
@@ -1778,6 +1779,16 @@ void DrawingML::WriteParagraphProperties( Reference< XTextContent > rParagraph )
     if( GETAD( ParaLineSpacing ) )
         bHasLinespacing = ( mAny >>= aLineSpacing );
 
+    bool bRtl = false;
+    if( GETA( WritingMode ) )
+    {
+        sal_Int16 nWritingMode;
+        if( ( mAny >>= nWritingMode ) && nWritingMode == text::WritingMode2::RL_TB )
+        {
+            bRtl = true;
+        }
+    }
+
     if( nLevel != -1
         || nAlignment != style::ParagraphAdjust_LEFT
         || bHasLinespacing )
@@ -1786,6 +1797,7 @@ void DrawingML::WriteParagraphProperties( Reference< XTextContent > rParagraph )
                               XML_lvl, nLevel > 0 ? I32S( nLevel ) : NULL,
                               XML_marL, NULL,
                               XML_algn, GetAlignment( nAlignment ),
+                              XML_rtl, bRtl ? BS(bRtl) : NULL,
                               FSEND );
 
         if( bHasLinespacing )

sd/qa/unit/export-tests.cxx

@@ -58,6 +58,7 @@
 #include <com/sun/star/graphic/XGraphic.hpp>
 #include <com/sun/star/frame/XStorable.hpp>
 #include <com/sun/star/drawing/FillStyle.hpp>
+ #include <com/sun/star/text/WritingMode2.hpp>
 #include <svx/svdotable.hxx>
 #include <com/sun/star/table/XTable.hpp>
 #include <com/sun/star/table/XMergeableCell.hpp>
@@ -91,6 +92,7 @@ public:
     void testBulletStartNumber();
     void testLineStyle();
     void testCellLeftAndRightMargin();
+    void testRightToLeftParaghraph();
 
 #if !defined WNT
     void testBnc822341();
@@ -118,6 +120,8 @@ public:
     CPPUNIT_TEST(testBulletStartNumber);
     CPPUNIT_TEST(testLineStyle);
     CPPUNIT_TEST(testCellLeftAndRightMargin);
+    CPPUNIT_TEST(testRightToLeftParaghraph);
+
 #if !defined WNT
     CPPUNIT_TEST(testBnc822341);
 #endif
@@ -836,6 +840,39 @@ void SdExportTest::testLineStyle()
 
 }
 
+void SdExportTest::testRightToLeftParaghraph()
+{
+        ::sd::DrawDocShellRef xDocShRef = loadURL(getURLFromSrc("/sd/qa/unit/data/pptx/rightToLeftParagraph.pptx"), PPTX);
+
+    xDocShRef = saveAndReload( xDocShRef, PPTX );
+
+    uno::Reference< drawing::XDrawPagesSupplier > xDoc(
+    xDocShRef->GetDoc()->getUnoModel(), uno::UNO_QUERY_THROW );
+
+    uno::Reference< drawing::XDrawPage > xPage(
+    xDoc->getDrawPages()->getByIndex(0), uno::UNO_QUERY_THROW );
+
+    uno::Reference< beans::XPropertySet > xShape(
+    xPage->getByIndex(0), uno::UNO_QUERY );
+    CPPUNIT_ASSERT_MESSAGE( "no shape", xShape.is() );
+
+    // Get first paragraph
+    uno::Reference<text::XText> xText = uno::Reference<text::XTextRange>(xShape, uno::UNO_QUERY)->getText();
+    CPPUNIT_ASSERT_MESSAGE( "not a text shape", xText.is() );
+    uno::Reference<container::XEnumerationAccess> paraEnumAccess;
+    paraEnumAccess.set(xText, uno::UNO_QUERY);
+    uno::Reference<container::XEnumeration> paraEnum = paraEnumAccess->createEnumeration();
+    uno::Reference<text::XTextRange> const xParagraph(paraEnum->nextElement(),
+                uno::UNO_QUERY_THROW);
+    uno::Reference< beans::XPropertySet > xPropSet( xParagraph, uno::UNO_QUERY_THROW );
+
+    sal_Int16 nWritingMode = 0;
+    xPropSet->getPropertyValue( "WritingMode" ) >>= nWritingMode;
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Wrong paragraph WritingMode", text::WritingMode2::RL_TB, nWritingMode);
+
+    xDocShRef->DoClose();
+}
+
 #if !defined WNT
 
 void SdExportTest::testBnc822341()