Thanks for making this script ! it helped me a lot :DI.... can't donate, but I wish I could. Maybe in the future...
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I think I have found an error that could be improved. Steps to reproduce:
1. Create manually a layer ResultLayer with no content or by doing an animation, selecting all frames of animations, and then deleting the content of ResultLayer (not the layer itself, just the drawn pixels).
2. Select all needed layers for the animation
3. Run the script
4. It should give the error message --> path_animator.lua:409: attempt to index a nil value (field 'integer index')
I noticed that deleting or refilling ResultLayer with ctrl+Z solves this, but I think it would be better to just let the script run with default values as if that layer is not there (The "create a new ResultLayer checkbutton" could be locked in Unchecked).
Another workaround is to give a more descriptive message for the user, maybe saying that ResultLayer should be filled with animation content to restore the previously used values or non-existent.
I assumed a lot here (didn't read the code), but even if I'm wrong in my assumptions I think a more descriptive message for every possible console error message is needed. This would make the tool easier to use.