sc lok: avoid placeholder row when providing all headers

In case the logic visible area is known, info is provided only about the
visible headers. Given that only relative sizes (no absolute positions)
are provided, a placeholder row/col is added to the result that contains
the total size of the skipped items.

These placeholder items are not needed when providing all headers, so
don't emit them.

Change-Id: I48ccb73554313f4d2bb420e4402995719b0f9f7d
(cherry picked from commit 788cec0a)

desktop/qa/desktop_lib/test_desktop_lib.cxx

@@ -72,6 +72,7 @@ public:
     void testSaveAs();
     void testSaveAsCalc();
     void testPasteWriter();
+    void testRowColumnHeaders();
 
     CPPUNIT_TEST_SUITE(DesktopLOKTest);
     CPPUNIT_TEST(testGetStyles);
@@ -84,6 +85,7 @@ public:
     CPPUNIT_TEST(testSaveAs);
     CPPUNIT_TEST(testSaveAsCalc);
     CPPUNIT_TEST(testPasteWriter);
+    CPPUNIT_TEST(testRowColumnHeaders);
     CPPUNIT_TEST_SUITE_END();
 
     uno::Reference<lang::XComponent> mxComponent;
@@ -352,6 +354,36 @@ void DesktopLOKTest::testPasteWriter()
     comphelper::LibreOfficeKit::setActive(false);
 }
 
+void DesktopLOKTest::testRowColumnHeaders()
+{
+    LibLODocument_Impl* pDocument = loadDoc("search.ods");
+    boost::property_tree::ptree aTree;
+    char* pJSON = pDocument->m_pDocumentClass->getCommandValues(pDocument, ".uno:ViewRowColumnHeaders");
+    std::stringstream aStream(pJSON);
+    free(pJSON);
+    CPPUNIT_ASSERT(!aStream.str().empty());
+
+    boost::property_tree::read_json(aStream, aTree);
+    for (boost::property_tree::ptree::value_type& rValue : aTree.get_child("rows"))
+    {
+        sal_Int32 nSize = OString(rValue.second.get<std::string>("size").c_str()).toInt32();
+        CPPUNIT_ASSERT(nSize > 0);
+        OString aText(rValue.second.get<std::string>("text").c_str());
+        // This failed, as the first item did not contain the text of the first row.
+        CPPUNIT_ASSERT_EQUAL(OString("1"), aText);
+        break;
+    }
+
+    for (boost::property_tree::ptree::value_type& rValue : aTree.get_child("columns"))
+    {
+        sal_Int32 nSize = OString(rValue.second.get<std::string>("size").c_str()).toInt32();
+        CPPUNIT_ASSERT(nSize > 0);
+        OString aText(rValue.second.get<std::string>("text").c_str());
+        CPPUNIT_ASSERT_EQUAL(OString("A"), aText);
+        break;
+    }
+}
+
 CPPUNIT_TEST_SUITE_REGISTRATION(DesktopLOKTest);
 
 CPPUNIT_PLUGIN_IMPLEMENT();

sc/source/ui/view/tabview.cxx

@@ -2332,7 +2332,7 @@ OUString ScTabView::getRowColumnHeaders(const Rectangle& rRectangle)
         }
         if (!bSkip)
         {
-            if (aRows.empty())
+            if (aRows.empty() && nTotal > 0)
             {
                 // The sizes are relative sizes, so include the total skipped size before the real items.
                 boost::property_tree::ptree aRow;
@@ -2369,7 +2369,7 @@ OUString ScTabView::getRowColumnHeaders(const Rectangle& rRectangle)
         }
         if (!bSkip)
         {
-            if (aCols.empty())
+            if (aCols.empty() && nTotal > 0)
             {
                 boost::property_tree::ptree aCol;
                 aCol.put("size", OString::number(long((nTotalPixels + 0.5) / aViewData.GetPPTX())).getStr());