which flushes out the fact that, previously, when
SfxItemSetFixed was being copied, we were not
actually taking advantage of the "internal" memory,
and were actually allocating a separate block of memory,
like a "normal" SfxItemSet.
Change-Id: I6a8073c58b464d53bfd2a54cf1dd27a3f2cb3df7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/160377
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
