Spread Loose Parts

# BLENDER 2.9x+ addon to evenly spread out loose parts of a single object in edit mode.
# written by Testure in response to a RCS thread: https://blender.community/c/rightclickselect/XQYk/
# INSTALLATION: drop this into your Blender/scripts/startup folder and restart Blender. Operator will be available in edit mode only.

import bpy

class MESH_OT_spread_loose(bpy.types.Operator):
    """Evenly spread out loose parts of a single object in edit mode"""
    bl_idname = "mesh.spread_loose"
    bl_label = "Spread Out Loose Parts"

    def __init__(self):
        self.original_origin = None

    def modal(self, context, event):
        # operator's modal is pass through, just listening for FINISH event conditions
        if event.type in { 'LEFTMOUSE', 'RIGHTMOUSE', 'ESC'} and event.value == "RELEASE":
            self.finish(context)
            return {'FINISHED'}
        return {'PASS_THROUGH'}

    @classmethod
    def poll(cls, context):
        return context.mode == 'EDIT_MESH' and len(context.selected_objects) == 1

    def finish(self, context):
        bpy.ops.object.join()
        cursor_matrix = context.scene.cursor.matrix.copy()
        context.scene.cursor.matrix = self.original_origin
        bpy.ops.object.origin_set(type='ORIGIN_CURSOR', center='MEDIAN')
        context.scene.cursor.matrix = cursor_matrix
        bpy.context.scene.tool_settings.use_transform_pivot_point_align = False
        bpy.ops.object.editmode_toggle()

    def invoke(self, context, event):
        self.original_origin = context.active_object.matrix_world.copy()
        bpy.ops.mesh.separate(type='LOOSE')
        bpy.ops.object.editmode_toggle()
        bpy.ops.object.origin_set(type='ORIGIN_GEOMETRY', center='MEDIAN')
        bpy.context.scene.tool_settings.use_transform_pivot_point_align = True

        bpy.ops.transform.resize('INVOKE_DEFAULT', constraint_axis=(False, False, False))
        context.window_manager.modal_handler_add(self)
        return {'RUNNING_MODAL'}

def register():
    bpy.utils.register_class(MESH_OT_spread_loose)


def unregister():
    bpy.utils.unregister_class(MESH_OT_spread_loose)


if __name__ == "__main__":
    register()