The general size of the image should be the same when width/height
attributes are present. It is very wrong to assume the size of the
image is the area covered by all the primitives in the image.

Change-Id: I56f241e84dee37796f9804ce2569c4eb416e83a0
Reviewed-on: https://gerrit.libreoffice.org/54191Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>