sc lok: use client zoom for ViewRowColumnHeaders

Change-Id: I85000851f82ea7cdc4b536683adbc8570de9af7e

desktop/qa/desktop_lib/test_desktop_lib.cxx

@@ -405,6 +405,9 @@ void DesktopLOKTest::testRowColumnHeaders()
      * "text" has the header label in UTF-8
      */
     LibLODocument_Impl* pDocument = loadDoc("search.ods");
+
+    pDocument->pClass->initializeForRendering(pDocument);
+
     boost::property_tree::ptree aTree;
     char* pJSON = pDocument->m_pDocumentClass->getCommandValues(pDocument, ".uno:ViewRowColumnHeaders");
     std::stringstream aStream(pJSON);

sc/source/ui/unoobj/docuno.cxx

@@ -884,9 +884,14 @@ void ScModelObj::setClientZoom(int nTilePixelWidth_, int nTilePixelHeight_, int
 OUString ScModelObj::getRowColumnHeaders(const Rectangle& rRectangle)
 {
     ScViewData* pViewData = ScDocShell::GetViewData();
+
     if (!pViewData)
         return OUString();
 
+    // update the aLogicMode in ScViewData to something predictable
+    pViewData->SetZoom(Fraction(nTilePixelWidth * TWIPS_PER_PIXEL, nTileTwipWidth),
+                       Fraction(nTilePixelHeight * TWIPS_PER_PIXEL, nTileTwipHeight), true);
+
     ScTabView* pTabView = pViewData->GetView();
     if (!pTabView)
         return OUString();