tdf#123912 ww8 export: re-protect implicit section

Sections should retain their protected on/off status
regardless of the value of PROTECT_FORM. However, if there
ARE no sections, then the implicit section should use the
document settings. The same is true for the pseudo -1 section
which I believe can only be the last section (the fragment
of the implicit section that follows the last real section).

This is basically a revert of LO 6.2 commit
fa667b6d, restoring
the previous behaviour in the case of the implicit section.

Change-Id: If0b473445e0add017504a3cb61b63116f92be5ce
Reviewed-on: https://gerrit.libreoffice.org/69957
Tested-by: Jenkins
Reviewed-by: Justin Luth <justin_luth@sil.org>

sw/qa/extras/ooxmlexport/ooxmlexport13.cxx

@@ -16,6 +16,7 @@
 #include <com/sun/star/text/XTextFramesSupplier.hpp>
 #include <com/sun/star/drawing/XControlShape.hpp>
 #include <com/sun/star/style/ParagraphAdjust.hpp>
+#include <IDocumentSettingAccess.hxx>
 
 #include <sfx2/docfile.hxx>
 #include <sfx2/docfilt.hxx>
@@ -70,6 +71,21 @@ DECLARE_OOXMLEXPORT_TEST(testendingSectionProps, "endingSectionProps.docx")
     CPPUNIT_ASSERT_EQUAL_MESSAGE("Section Left Margin", sal_Int32(2540), getProperty<sal_Int32>(xSect, "SectionLeftMargin"));
 }
 
+DECLARE_OOXMLEXPORT_TEST(tdf123912_protectedForm, "tdf123912_protectedForm.odt")
+{
+    SwXTextDocument* pTextDoc = dynamic_cast<SwXTextDocument *>(mxComponent.get());
+    CPPUNIT_ASSERT(pTextDoc);
+    SwDoc* pDoc = pTextDoc->GetDocShell()->GetDoc();
+    CPPUNIT_ASSERT_EQUAL_MESSAGE("Compatibility: Protect form", true,
+                                 pDoc->getIDocumentSettingAccess().get( DocumentSettingId::PROTECT_FORM ) );
+
+    uno::Reference<text::XTextSectionsSupplier> xTextSectionsSupplier(mxComponent, uno::UNO_QUERY);
+    uno::Reference<container::XIndexAccess> xSections(xTextSectionsSupplier->getTextSections(), uno::UNO_QUERY);
+    uno::Reference<beans::XPropertySet> xSect(xSections->getByIndex(0), uno::UNO_QUERY);
+    if ( xSect.is() )
+        CPPUNIT_ASSERT_EQUAL_MESSAGE("Section1 is protected", true, getProperty<bool>(xSect, "IsProtected"));
+}
+
 DECLARE_OOXMLEXPORT_TEST(testDateControl, "empty-date-control.odt")
 {
     // Check that we did not lost the date control

sw/source/filter/ww8/wrtw8sty.cxx

@@ -1526,7 +1526,11 @@ void MSWordExportBase::SectionProperties( const WW8_SepInfo& rSepInfo, WW8_PdAtt
     AttrOutput().SectFootnoteEndnotePr();
 
     // forms
-    AttrOutput().SectionFormProtection( rSepInfo.IsProtected() );
+    bool bFormProtection = rSepInfo.IsProtected();
+    // use document settings when SepInfo has no protect settings (last section fragment or no sections at all)
+    if ( !rSepInfo.pSectionFormat || (reinterpret_cast<SwSectionFormat*>(sal_IntPtr(-1)) == rSepInfo.pSectionFormat) )
+        bFormProtection |= m_pDoc->getIDocumentSettingAccess().get( DocumentSettingId::PROTECT_FORM );
+    AttrOutput().SectionFormProtection( bFormProtection );
 
     // line numbers
     const SwLineNumberInfo& rLnNumInfo = m_pDoc->GetLineNumberInfo();