loplugin:stringadd look through a couple more known-good methods

Change-Id: Ifbdb3e41eae665f7dcaf5301aaba2b6e4662cf48
Reviewed-on: https://gerrit.libreoffice.org/80855
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 3 insertions, 4 deletions

diff --git a/filter/source/pdf/pdfexport.cxx b/filter/source/pdf/pdfexport.cxx
index 2cf302bda668..199bcf10cb14 100644
--- a/filter/source/pdf/pdfexport.cxx
+++ b/filter/source/pdf/pdfexport.cxx
@@ -1178,10 +1178,9 @@ void PDFExport::ImplWriteTiledWatermark( vcl::PDFWriter& rWriter, const Size& rP
 
     while(lnCount)
     {
-        OUString tempstr = watermark;
-        watermark = watermark.copy(0, lnIndex);
-        watermark += "\n";
-        watermark += tempstr.copy(lnIndex);
+        watermark = watermark.copy(0, lnIndex) +
+            "\n" +
+            watermark.copy(lnIndex);
         lnIndex += lineLength;
         lnCount--;
     }