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, 2 insertions, 2 deletions

diff --git a/toolkit/source/awt/animatedimagespeer.cxx b/toolkit/source/awt/animatedimagespeer.cxx
index 58e9f6c09a1a..a0fa5cc71567 100644
--- a/toolkit/source/awt/animatedimagespeer.cxx
+++ b/toolkit/source/awt/animatedimagespeer.cxx
@@ -117,9 +117,9 @@ namespace toolkit
             ENSURE_OR_RETURN( separatorPos != -1, "lcl_getHighContrastURL: unsupported URL scheme - cannot automatically determine HC version!", i_imageURL );
 
             OUStringBuffer composer;
-            composer.append( i_imageURL.copy( 0, separatorPos ) );
+            composer.appendCopy( i_imageURL, 0, separatorPos );
             composer.append( "/sifr" );
-            composer.append( i_imageURL.copy( separatorPos ) );
+            composer.appendCopy( i_imageURL, separatorPos );
             return composer.makeStringAndClear();
         }