add operator+=(OUStringBuffer) method to OUString

to reduce needless object creation and copying some more

And fix what looks like a bug in CSS hex color parsing at line
609 in sw/../parcss1.cxx that has been there since
commit 7b0b5cdfeed656b279bc32cd929630d5fc25878b "initial import"

Change-Id: Ibad42b23721a56493bd1edcd7165e6104494a5c3
Reviewed-on: https://gerrit.libreoffice.org/58357
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/basic/source/runtime/methods.cxx b/basic/source/runtime/methods.cxx
index 756c9d044f87..4a1a6b66cd29 100644
--- a/basic/source/runtime/methods.cxx
+++ b/basic/source/runtime/methods.cxx
@@ -3409,7 +3409,7 @@ void SbRtl_FormatNumber(StarBASIC*, SbxArray& rPar, bool)
         {
             OUStringBuffer sBuf;
             comphelper::string::padToLength(sBuf, nNumDigitsAfterDecimal - nActualDigits, '0');
-            aResult += sBuf.makeStringAndClear();
+            aResult += sBuf;
         }
     }