FYI, I have proposed a fix for this. See pull request here:
https://github.com/darktable-org/darktable/pull/188
--
Pascal Obry / Magny Les Hameaux (78)
The best way to travel is by means of imagination
http://v2p.fr.eu.org
http://www.obry.net
gpg --keyserver keys.gnupg.net --re
Take image + xmp here:
http://pascal.obry.pagesperso-orange.fr/imgxmp.zip
There is a watermark and a border. All looks fine, the watermark is
placed top/left just below the border with a slight offset).
Now just do a crop of half the picture for example. The watermark will
move into the bord
