gegl filters in batch processing

[Ofnuts]

I don't see where your code loads a new image in each iteration of the loop. My first call would be to add a print statement or gimp-message call to check that the iteration happens, and on what filepath and image ID.

On a different matter, in Gimp3 script-fu has lost most of its advantages over Python, all that is left is a contrived syntax and plenty of restrictions.