5 files changed, 27 insertions, 4 deletions
diff --git a/sc/qa/unit/data/xlsx/tdf58243.xlsx b/sc/qa/unit/data/xlsx/tdf58243.xlsx
new file mode 100644
index 000000000000..f95e13b4b6db
--- /dev/null
+++ b/sc/qa/unit/data/xlsx/tdf58243.xlsx
diff --git a/sc/qa/unit/subsequent_export_test2.cxx b/sc/qa/unit/subsequent_export_test2.cxx
index ad3f125db7d9..9776b1629197 100644
--- a/sc/qa/unit/subsequent_export_test2.cxx
+++ b/sc/qa/unit/subsequent_export_test2.cxx
@@ -217,6 +217,7 @@ public:
     void testTdf145059();
     void testTdf130104_XLSXIndent();
     void testWholeRowBold();
+    void testXlsxRowsOrder();
 
     CPPUNIT_TEST_SUITE(ScExportTest2);
 
@@ -333,6 +334,7 @@ public:
     CPPUNIT_TEST(testTdf145059);
     CPPUNIT_TEST(testTdf130104_XLSXIndent);
     CPPUNIT_TEST(testWholeRowBold);
+    CPPUNIT_TEST(testXlsxRowsOrder);
 
     CPPUNIT_TEST_SUITE_END();
 
@@ -3113,6 +3115,15 @@ void ScExportTest2::testWholeRowBold()
     xDocSh3->DoClose();
 }
 
+void ScExportTest2::testXlsxRowsOrder()
+{
+    ScDocShellRef xDocSh = loadDoc(u"tdf58243.", FORMAT_XLSX);
+    CPPUNIT_ASSERT(xDocSh.is());
+    // Make sure code in SheetDataBuffer doesn't assert columns/rows sorting.
+    ScBootstrapFixture::exportTo(*xDocSh, FORMAT_XLSX);
+    xDocSh->DoClose();
+}
+
 CPPUNIT_TEST_SUITE_REGISTRATION(ScExportTest2);
 
 CPPUNIT_PLUGIN_IMPLEMENT();
diff --git a/sc/source/core/data/attarray.cxx b/sc/source/core/data/attarray.cxx
index 5af0e3b3609d..1b84ae4616a5 100644
--- a/sc/source/core/data/attarray.cxx
+++ b/sc/source/core/data/attarray.cxx
@@ -930,6 +930,15 @@ void ScAttrArray::SetAttrEntries(std::vector<ScAttrEntry> && vNewData)
         pDocPool->Remove(*rEntry.pPattern);
 
     mvData = std::move(vNewData);
+
+#ifdef DBG_UTIL
+    SCROW lastEndRow = -1;
+    for(const auto& entry : mvData)
+    {   // Verify that the data is not corrupted.
+        assert(entry.nEndRow > lastEndRow);
+        lastEndRow = entry.nEndRow;
+    }
+#endif
 }
 
 static void lcl_MergeDeep( SfxItemSet& rMergeSet, const SfxItemSet& rSource )
diff --git a/sc/source/filter/inc/sheetdatabuffer.hxx b/sc/source/filter/inc/sheetdatabuffer.hxx
index 33366fde9f9e..8eee9f7b79b0 100644
--- a/sc/source/filter/inc/sheetdatabuffer.hxx
+++ b/sc/source/filter/inc/sheetdatabuffer.hxx
@@ -199,14 +199,19 @@ private:
     {
         bool operator() (const RowRangeStyle& lhs, const RowRangeStyle& rhs) const
         {
-            return lhs.mnStartRow<rhs.mnStartRow;
+            // This end-vs-start comparison is needed by the lower_bound() use
+            // in SheetDataBuffer::addColXfStyleProcessRowRanges() that searches
+            // for partially overlapping ranges. In all other places the ranges
+            // should be non-overlapping, in which case this is the same as the "normal"
+            // comparison.
+            return lhs.mnEndRow<rhs.mnStartRow;
         }
     };
     struct StyleRowRangeCompEqual
     {
         bool operator() (const RowRangeStyle& lhs, const RowRangeStyle& rhs) const
         {
-            return lhs.mnStartRow==rhs.mnStartRow;
+            return lhs.mnStartRow==rhs.mnStartRow && lhs.mnEndRow == rhs.mnEndRow;
         }
     };
     typedef ::o3tl::sorted_vector< RowRangeStyle, StyleRowRangeComp > RowStyles;
diff --git a/sc/source/filter/oox/sheetdatabuffer.cxx b/sc/source/filter/oox/sheetdatabuffer.cxx
index 6dbec9e6bd9d..259e3190107b 100644
--- a/sc/source/filter/oox/sheetdatabuffer.cxx
+++ b/sc/source/filter/oox/sheetdatabuffer.cxx
@@ -409,8 +409,6 @@ void SheetDataBuffer::addColXfStyleProcessRowRanges()
                 RowRangeStyle aStyleRows;
                 aStyleRows.mnNumFmt.first = nXfId;
                 aStyleRows.mnNumFmt.second = -1;
-                aStyleRows.mnStartRow = rRange.mnFirst;
-                aStyleRows.mnEndRow = rRange.mnLast;
 
                 // Reset row range for each column
                 aStyleRows.mnStartRow = rRange.mnFirst;