fix translate/rotate with retina display


git-svn-id: https://geuz.org/svn/gmsh/trunk@18704 59c8cabf-10d6-4a28-b43f-3936b85956c4
remove printf


git-svn-id: https://geuz.org/svn/gmsh/trunk@18705 59c8cabf-10d6-4a28-b43f-3936b85956c4
git-svn-id: https://geuz.org/svn/gmsh/trunk@18706 59c8cabf-10d6-4a28-b43f-3936b85956c4