handle properly page breaks even if a page contains only a frame (fdo#55381)

The test document has 4 pages which only contain frames, first 3 pages
(sections) have <p> block with <framePr> and another <p> with just <sectPr>,
and the second paragraph would be removed, thus there would be no nodes on which
to actually set the page style and they would be set on nodes for the previous
page, overwriting its page style. The last page does not have its own <p>
at all, so it needs to be faked.

The changes in finishParagraph() are because of e.g. the comments-nested.odt
sw test, which there causes exception because of unknown property ParaStyleName
(comments do not use those it seems) and the code is skipped over (which
is probably a bug on its own, but it's unrelated to this change otherwise).

Change-Id: I9d37f992407a9b649c710d2a031ec4447fb11771

sw/qa/extras/ooxmlimport/ooxmlimport.cxx

@@ -2056,6 +2056,15 @@ DECLARE_OOXMLIMPORT_TEST(testFdo75722dml, "fdo75722-dml.docx")
     CPPUNIT_ASSERT_EQUAL(sal_Int64(3128), nRot);
 }
 
+DECLARE_OOXMLIMPORT_TEST(testFdo55381, "fdo55381.docx")
+{
+    uno::Reference<frame::XModel> xModel(mxComponent, uno::UNO_QUERY);
+    uno::Reference<text::XTextViewCursorSupplier> xTextViewCursorSupplier(xModel->getCurrentController(), uno::UNO_QUERY);
+    uno::Reference<text::XPageCursor> xCursor(xTextViewCursorSupplier->getViewCursor(), uno::UNO_QUERY);
+    xCursor->jumpToLastPage();
+    CPPUNIT_ASSERT_EQUAL(sal_Int16(4), xCursor->getPage());
+}
+
 #endif
 
 CPPUNIT_PLUGIN_IMPLEMENT();

writerfilter/source/dmapper/DomainMapper.cxx

@@ -2458,6 +2458,18 @@ void DomainMapper::lcl_endSectionGroup()
     {
         m_pImpl->CheckUnregisteredFrameConversion();
         m_pImpl->ExecuteFrameConversion();
+        if(m_pImpl->GetIsFirstParagraphInSection())
+        {
+            // This section has no paragraph at all (e.g. they are all actually in a frame).
+            // If this section has a page break, there would be nothing to apply to the page
+            // style, so force a dummy paragraph.
+            lcl_startParagraphGroup();
+            lcl_startCharacterGroup();
+            sal_uInt8 sBreak[] = { 0xd };
+            lcl_text(sBreak, 1);
+            lcl_endCharacterGroup();
+            lcl_endParagraphGroup();
+        }
         PropertyMapPtr pContext = m_pImpl->GetTopContextOfType(CONTEXT_SECTION);
         SectionPropertyMap* pSectionContext = dynamic_cast< SectionPropertyMap* >( pContext.get() );
         OSL_ENSURE(pSectionContext, "SectionContext unavailable!");

writerfilter/source/dmapper/DomainMapper_Impl.cxx

@@ -1105,12 +1105,6 @@ void DomainMapper_Impl::finishParagraph( PropertyMapPtr pPropertyMap )
                 uno::Reference< text::XTextRange > xParaEnd( xCur, uno::UNO_QUERY );
                 CheckParaMarkerRedline( xParaEnd );
 
-                m_bIsFirstParaInSection = false;
-                m_bIsLastParaInSection = false;
-                m_bParaChanged = false;
-
-                // Reset the frame properties for the next paragraph
-                pParaContext->ResetFrameProperties();
             }
             if( !bKeepLastParagraphProperties )
                 rAppendContext.pLastParagraphProperties = pToBeSavedProperties;
@@ -1119,11 +1113,22 @@ void DomainMapper_Impl::finishParagraph( PropertyMapPtr pPropertyMap )
         {
             OSL_FAIL( "IllegalArgumentException in DomainMapper_Impl::finishParagraph" );
         }
-        catch(const uno::Exception&)
+        catch(const uno::Exception& e)
         {
+            SAL_WARN( "writerfilter", "finishParagraph() exception: " << e.Message );
         }
     }
 
+    m_bParaChanged = false;
+    if(!pParaContext->IsFrameMode())
+    { // If the paragraph is in a frame, it's not a paragraph of the section itself.
+        m_bIsFirstParaInSection = false;
+        m_bIsLastParaInSection = false;
+    }
+
+    // Reset the frame properties for the next paragraph
+    pParaContext->ResetFrameProperties();
+
 #ifdef DEBUG_DOMAINMAPPER
     dmapper_logger->endElement();
 #endif