after-delete (augments, and augmentable only) in text:info-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-text:info-mixin after-delete start len void
     start : exact non-negative integer
     len : exact non-negative integer

  Calls the editor-position-changed method of the frame that is viewing this object. It uses get-canvas to get the canvas for this frame, and uses that canvas's top-level-window<%> as the frame.