How to merge parts of an image aligned to their edges?

[Ofnuts]

I would duplicate the layer, crop each layer to a horizontal strip with a group of lines, and then move them around and merge the result. If you need to do this to many files (or have more than two instances of the problem, two scripts that can help:

• ofn-guillotine-layer to split a layer using guides
  
• ofn-swap-strips to exchange the positions of two adjacent strips designated by guides
  

Both available here: https://sourceforge.net/projects/gimp-to...s/scripts/