feature idea: panoramic or multi-stage outpainting mode

[parlance-zz]

    feature idea: panoramic or multi-stage outpainting mode

basically if you take a 512x512 image where one half is image and the right half is erased (like the ghibli shack pic you were using during testing) and outpaint a new half for it, it would be nice if there were an easy way (from inside the gallery viewer even?) to take that new half and place it in its own new image all the way on the left so that the right side is once again blank/erased, and outpaint again, eventually creating a panorama (could also be done vertically of course, or maybe even in multiple directions, but that would require more RAM?).
For double extra bonus credits, the gallery viewer should be able to take the original starting image and automatically append it to the left side of the outputs from the second stage (so the second stage would be generating a 512x512 and the gallery would be taking your original 256x512 chunk and glueing it to the side) so you can more easily/quickly see which new images best 'match' the shape or feel of the original.

Originally posted by @lootsorrow in #36 (comment)

[parlance-zz]

#36 (comment)

#36 (comment)

[parlance-zz]

Closing as dupe, moved to #37