Fix second problem of issue 338 by truly recalculating the new center from the bbox
Fix second problem of issue 338 by truly recalculating the new center from the bbox

git-svn-id: 829f041edcabe93b7893c4ec42f5993156d1fcf0@968 eee81c28-f429-11dd-99c0-75d572ba1ddd

johan/svg-edit,santiagoaguiar/svg-edit,santiagoaguiar/svg-edit,johan/svg-edit,santiagoaguiar/svg-edit,santiagoaguiar/svg-edit,johan/svg-edit