(comint-output-filter):

(comint-output-filter):
  Revert to using `insert-before-markers'.
  Add bletcherous hack to undo damage caused by `insert-before-markers'.
  Put `front-sticky' property on overlays created here so that the field code
    understands how the overlay works.
  Use a let when making comint-last-prompt-overlay, so that the code is
    easier to read.