on-delete

Called before a range is deleted from the buffer. If the return value is #f, then the delete will be aborted. Otherwise, after-delete is guaranteed to be called after the delete has completed.

The buffer is internally locked for writing during a call to this method (see also Locks). Use after-delete to modify the buffer, if necessary.

See also on-edit-sequence.

• (send a-mred:hyper-edit on-delete start size) -> boolean
      start : int
      size : int

  Calls adjust-lists and returns #t.