TIFF loader does not handle all types of orientation equally
Submitted by Jef Driesen
This is a follow-up to bug 428725, where the ability to add tiff and jpeg/exif orientation tags was added to the pixbuf loaders.
Libtiff does not perform rotations  (because that requires swapping the height and width of the image). To compensate for the partial transformations, an orientation option is attached to the resulting pixbuf. The application needs to take care of this option to display the image with the correct orientation.
I think we should use either the orientation option or the automatic rotation, but not a mixture of both. Because with the current situation, depending on the orientation value of the image, you can end up with three different situations: no transformation, a partial transformation or a full transformation.
Version: git master