Gimp Python-Fu script that copies selection to new layer and autocrops layer.

selection_to_layer_cropped.py

#!/usr/bin/env python
from gimpfu import *


def python_selection_to_layer_cropped(image, drawable, layer_name):
    pdb.gimp_image_undo_group_start(image)
    prev_layer = image.active_layer

    pdb.gimp_edit_copy(image.active_layer)
    fsel = pdb.gimp_edit_paste(drawable, False)
    pdb.gimp_floating_sel_to_layer(fsel)
    image.active_layer.name = layer_name
    pdb.plug_in_autocrop_layer(image, image.active_layer)
    image.active_layer = prev_layer

    pdb.gimp_image_undo_group_end(image)


register(
    "python_fu_selection_to_layer_cropped",
    "Create new layer from selection and auto crop layer",
    "Create new layer from selection and auto crop layer",
    "https://github.com/fre-sch",
    "https://github.com/fre-sch",
    "2016",
    "<Image>/Filters/Selection to Layer (cropped)...",
    "RGB*, GRAY*",
    [
    (PF_STRING, "layer_name", "Name for new layer", ""),
    ],
    [],
    python_selection_to_layer_cropped
)

main()