put-file in editor<%>

Called when the user must be queried for a filename to save an editor. Starting directory and default name strings are passed in, but either may be #f to indicate that any directory is fine or there is no default name.

• (send an-editor put-file directory default-name) -> string or #f
   directory : string or #f
   default-name : string or #f

  Calls the global put-fileprocedure.

  If the editor is displayed in a single canvas, then the canvas's top-level frame is used as the parent for the file dialog. Otherwise, the file dialog will have no parent.