after-delete (augments, and augmentable only) in mode:host-text-mixin

Called after a given range is deleted from the editor (and after the display is refreshed; use on-delete and begin-edit-sequence to avoid extra refreshes when after-delete modifies the editor).

See also can-delete? and on-edit-sequence.

No internals locks are set when this method is called.

• (send a-mode:host-text-mixin after-delete orig super-call start len ???
     orig : ???
     super-call : (??? -> ???)
     start : ??
     len : ??

  If a surrogate is set, calls the surrogate with the arguments it was passed, plus this and a function that calls the super method.

  if a surrogate is not set, calls the super method and returns that result.