DOCX export: fix line spacing when spacing is 0

When the input was:

<w:pPr>
<w:spacing w:line="0" w:lineRule="atLeast"/>
</w:pPr>

Then we used to write:

<w:pPr>
<w:spacing w:lineRule="auto"/>
</w:pPr>

which is clarly wrong.

The comment at the end of AttributeOutputBase::ParaLineSpacing()
documents the intention reasonably clearly (and is in sync with what's
in the DOC and DOCX spec), adapt
DocxAttributeOutput::ParaLineSpacing_Impl() accordingly.

Change-Id: I60cbc3392a6460ba2760b2c02ae0755726478ec1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/87351
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

2 files changed, 31 insertions, 4 deletions

diff --git a/sw/qa/extras/ooxmlexport/ooxmlexport14.cxx b/sw/qa/extras/ooxmlexport/ooxmlexport14.cxx
index d582e777de06..1b4bf79fdc2d 100644
--- a/sw/qa/extras/ooxmlexport/ooxmlexport14.cxx
+++ b/sw/qa/extras/ooxmlexport/ooxmlexport14.cxx
@@ -20,6 +20,8 @@
 #include <com/sun/star/text/TableColumnSeparator.hpp>
 #include <com/sun/star/text/XDocumentIndex.hpp>
 #include <com/sun/star/text/RelOrientation.hpp>
+#include <com/sun/star/style/LineSpacing.hpp>
+#include <com/sun/star/style/LineSpacingMode.hpp>
 
 class Test : public SwModelTestBase
 {
@@ -219,6 +221,33 @@ DECLARE_OOXMLEXPORT_TEST(testTdf121658, "tdf121658.docx")
     assertXPath(pXmlSettings, "/w:settings/w:doNotHyphenateCaps");
 }
 
+CPPUNIT_TEST_FIXTURE(SwModelTestBase, testZeroLineSpacing)
+{
+    // Create the doc model.
+    loadURL("private:factory/swriter", nullptr);
+    uno::Reference<beans::XPropertySet> xParagraph(getParagraph(1), uno::UNO_QUERY);
+    style::LineSpacing aSpacing;
+    aSpacing.Mode = style::LineSpacingMode::MINIMUM;
+    aSpacing.Height = 0;
+    xParagraph->setPropertyValue("ParaLineSpacing", uno::makeAny(aSpacing));
+
+    // Export to docx.
+    uno::Reference<frame::XStorable> xStorable(mxComponent, uno::UNO_QUERY);
+    utl::MediaDescriptor aMediaDescriptor;
+    aMediaDescriptor["FilterName"] <<= OUString("Office Open XML Text");
+    xStorable->storeToURL(maTempFile.GetURL(), aMediaDescriptor.getAsConstPropertyValueList());
+    mbExported = true;
+    xmlDocPtr pXmlDoc = parseExport("word/document.xml");
+    CPPUNIT_ASSERT(pXmlDoc);
+
+    // Without the accompanying fix in place, this test would have failed with:
+    // - Expected: atLeast
+    // - Actual  : auto
+    // i.e. the minimal linespacing was lost on export.
+    assertXPath(pXmlDoc, "/w:document/w:body/w:p/w:pPr/w:spacing", "lineRule", "atLeast");
+    assertXPath(pXmlDoc, "/w:document/w:body/w:p/w:pPr/w:spacing", "line", "0");
+}
+
 CPPUNIT_TEST_FIXTURE(SwModelTestBase, testSemiTransparentText)
 {
     // Create an in-memory empty document.
diff --git a/sw/source/filter/ww8/docxattributeoutput.cxx b/sw/source/filter/ww8/docxattributeoutput.cxx
index d30d19eaad66..cef9035c15e9 100644
--- a/sw/source/filter/ww8/docxattributeoutput.cxx
+++ b/sw/source/filter/ww8/docxattributeoutput.cxx
@@ -7724,20 +7724,18 @@ void DocxAttributeOutput::ParaLineSpacing_Impl( short nSpace, short nMulti )
                 FSNS( XML_w, XML_lineRule ), "exact",
                 FSNS( XML_w, XML_line ), OString::number( -nSpace ).getStr() );
     }
-    else if( nMulti )
+    else if( nSpace > 0 && nMulti )
     {
         AddToAttrList( m_pParagraphSpacingAttrList, 2,
                 FSNS( XML_w, XML_lineRule ), "auto",
                 FSNS( XML_w, XML_line ), OString::number( nSpace ).getStr() );
     }
-    else if ( nSpace > 0 )
+    else
     {
         AddToAttrList( m_pParagraphSpacingAttrList, 2,
                 FSNS( XML_w, XML_lineRule ), "atLeast",
                 FSNS( XML_w, XML_line ), OString::number( nSpace ).getStr() );
     }
-    else
-        AddToAttrList( m_pParagraphSpacingAttrList, FSNS( XML_w, XML_lineRule ), "auto" );
 }
 
 void DocxAttributeOutput::ParaAdjust( const SvxAdjustItem& rAdjust )