tdf#129452 DOCX import: fix bottom border of merged column

Bottom border of a vertically merged column of a table was missing
if the inside borders were turned off and the merge included the
last cell of the column. This happened because the first cell
(topmost) in a set of vertically merged cells determines the borders
of the new merged cell, and the turned off inside borders were at
the bottom in this case.

Change-Id: I3d3defad18a1315117a554a36ad599eb46daffe9
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/85988
Reviewed-by: László Németh <nemeth@numbertext.org>
Tested-by: László Németh <nemeth@numbertext.org>

3 files changed, 27 insertions, 3 deletions

diff --git a/sw/qa/extras/ooxmlexport/data/tdf129452_BottomBorders.docx b/sw/qa/extras/ooxmlexport/data/tdf129452_BottomBorders.docx
new file mode 100644
index 000000000000..0e8ddd6d3833
--- /dev/null
+++ b/sw/qa/extras/ooxmlexport/data/tdf129452_BottomBorders.docx
diff --git a/sw/qa/extras/ooxmlexport/ooxmlexport3.cxx b/sw/qa/extras/ooxmlexport/ooxmlexport3.cxx
index 41aa0b7d1ac8..48257077f0c3 100644
--- a/sw/qa/extras/ooxmlexport/ooxmlexport3.cxx
+++ b/sw/qa/extras/ooxmlexport/ooxmlexport3.cxx
@@ -1057,6 +1057,19 @@ DECLARE_OOXMLEXPORT_TEST(testBottomBorder, "tdf129450_BottomBorder.docx")
     assertXPath(pXmlDocument, "/w:document/w:body/w:tbl/w:tr/w:tc[1]/w:tcPr/w:tcBorders/w:bottom [@w:val = 'nil']", 0);
 }
 
+DECLARE_OOXMLEXPORT_TEST(testBottomBorders, "tdf129452_BottomBorders.docx")
+{
+    // tdf#129452: Do not omit bottom borders when a column in a table is vertically merged and
+    // the inside borders are turned off.
+
+    xmlDocPtr pXmlDocument = parseExport("word/document.xml");
+    if (!pXmlDocument)
+        return;
+
+    assertXPath(pXmlDocument, "/w:document/w:body/w:tbl/w:tr[4]/w:tc[1]/w:tcPr/w:tcBorders/w:bottom [@w:val = 'nil']", 0);
+    assertXPath(pXmlDocument, "/w:document/w:body/w:tbl/w:tr[4]/w:tc[2]/w:tcPr/w:tcBorders/w:bottom [@w:val = 'nil']", 0);
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/writerfilter/source/dmapper/DomainMapperTableHandler.cxx b/writerfilter/source/dmapper/DomainMapperTableHandler.cxx
index 9f376b3c07e8..31ce6b21d2c9 100644
--- a/writerfilter/source/dmapper/DomainMapperTableHandler.cxx
+++ b/writerfilter/source/dmapper/DomainMapperTableHandler.cxx
@@ -98,7 +98,7 @@ static void lcl_mergeBorder( PropertyIds nId, const PropertyMapPtr& pOrig, const
 }
 
 static void lcl_computeCellBorders( const PropertyMapPtr& pTableBorders, const PropertyMapPtr& pCellProps,
-        sal_Int32 nCell, sal_Int32 nRow, bool bIsEndCol, bool bIsEndRow )
+        sal_Int32 nCell, sal_Int32 nRow, bool bIsEndCol, bool bIsEndRow, bool bMergedVertically )
 {
     o3tl::optional<PropertyMap::Property> pVerticalVal = pCellProps->getProperty(META_PROP_VERTICAL_BORDER);
     o3tl::optional<PropertyMap::Property> pHorizontalVal = pCellProps->getProperty(META_PROP_HORIZONTAL_BORDER);
@@ -157,10 +157,13 @@ static void lcl_computeCellBorders( const PropertyMapPtr& pTableBorders, const P
     if ( nRow == 0 )
     {
         lcl_mergeBorder( PROP_TOP_BORDER, pTableBorders, pCellProps );
-        if ( pHorizontalVal )
+        if ( pHorizontalVal && !bMergedVertically )
             pCellProps->Insert( PROP_BOTTOM_BORDER, aHorizProp, false );
     }
 
+    if ( bMergedVertically )
+        lcl_mergeBorder( PROP_BOTTOM_BORDER, pTableBorders, pCellProps );
+
     if ( bIsEndRow )
     {
         lcl_mergeBorder( PROP_BOTTOM_BORDER, pTableBorders, pCellProps );
@@ -864,7 +867,15 @@ CellPropertyValuesSeq_t DomainMapperTableHandler::endTableGetCellProperties(Tabl
                     rInfo.pTableBorders->Erase(META_PROP_HORIZONTAL_BORDER);
                 }
 
-                lcl_computeCellBorders( rInfo.pTableBorders, *aCellIterator, nCell, nRow, bIsEndCol, bIsEndRow );
+                // tdf#129452 Checking if current cell is vertically merged with all the other cells below to the bottom.
+                // This must be done in order to apply the bottom border of the table to the first cell in a vertical merge.
+                bool bMergedVertically = bool(m_aCellProperties[nRow][nCell]->getProperty(PROP_VERTICAL_MERGE));
+
+                for (size_t i = nRow + 1; bMergedVertically && i < m_aCellProperties.size(); i++)
+                    if ( m_aCellProperties[i].size() > sal::static_int_cast<std::size_t>(nCell) )
+                        bMergedVertically = bool(m_aCellProperties[i][nCell]->getProperty(PROP_VERTICAL_MERGE));
+
+                lcl_computeCellBorders( rInfo.pTableBorders, *aCellIterator, nCell, nRow, bIsEndCol, bIsEndRow, bMergedVertically );
 
                 //now set the default left+right border distance TODO: there's an sprm containing the default distance!
                 aCellIterator->get()->Insert( PROP_LEFT_BORDER_DISTANCE,