09-05-2020, 10:26 PM
Unfortunately I can only confirm the problem. The Python API is OK on Gimp 2.8.
In the case at hand, you will notice the big "G" icon in the menu entry. This means that the function is implemented with GEGL, which is the new "core" in Gimp. The plugin is a backward-compatibility facade that calls the GEGL code but in this case it doesn't work (it works for others, for instance the Gaussian blur).
However since this is GEGL, you can call the GEGL function directly, but this is somewhat more complicated.
In the case at hand, you will notice the big "G" icon in the menu entry. This means that the function is implemented with GEGL, which is the new "core" in Gimp. The plugin is a backward-compatibility facade that calls the GEGL code but in this case it doesn't work (it works for others, for instance the Gaussian blur).
However since this is GEGL, you can call the GEGL function directly, but this is somewhat more complicated.