grow-sel-by4.scm

(define (script-fu-grow-sel-4 img)
  (gimp-context-push)
  (gimp-image-undo-group-start img)
  (gimp-selection-grow img 4)
  (gimp-image-undo-group-end img)
  (gimp-context-pop))

(script-fu-register "script-fu-grow-sel-4"
                    _"<Image>/Select/Grow by 4px"
                    "Grows the current selection by exactly 4 pixels."
                    "Esteban Manchado Velazquez"
                    "Esteban Manchado Velazquez"
                    "2016"
                    "RGB*, GRAY*"
                    SF-IMAGE "Image" 0)