Makes no sense (and would case serious problems) to set the size
(pixel) from the outside of the BitmapEx.
Change-Id: Iab597f755d45be2380884ec6685d119fcc8b1e98
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/164946
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
71efd60464