create appendCopy method in OUStringBuffer

so we can avoid temporary copies when appending a substring of an
OUString to the buffer. I would have preferred to call the method just
"append" but that results in ambiguous method errors when the callsite
is something like
sal_Int32 n;
OUStringBuffer s;
s.append(n, 10);
I'm not sure why

Change-Id: I6b5b6641fcb5b26ce2269f89ef06e03c0b6aa76f
Reviewed-on: https://gerrit.libreoffice.org/58666
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/configmgr/qa/unit/test.cxx b/configmgr/qa/unit/test.cxx
index 2c8138abe19e..1ea04c4081f1 100644
--- a/configmgr/qa/unit/test.cxx
+++ b/configmgr/qa/unit/test.cxx
@@ -553,7 +553,7 @@ void normalize(
     } else {
         OUStringBuffer buf(path);
         buf.append('/');
-        buf.append(relative.copy(0, i));
+        buf.appendCopy(relative, 0, i);
         *normalizedPath = buf.makeStringAndClear();
         *name = relative.copy(i + 1);
     }