Comment 1 for bug 255077

Unfortunately, that will not be possible, I think. That is because the way the tiles arrangement algorithm works is that it assumes all of them are in the same "grid" - so it doesn't have to calculate whether a tile has to be dropped from one side and added to another for each layer. Such a thing should definitely be done on the image data. I imagine we could integrate a way for the user to report a pixel offset, and to retile the image once the offset has been confirmed. But for this, the tiling process would have to be automated. If we could store a URL to the original image in the database for each image, and find a way to start the process and reload the images into the database, this could work...