on-new-box

Creates and returns a new snip for an embedded editor. This method is called by insert-box.

• (send an-editor on-new-box type) -> snip% object
      type : symbol in '(text pasteboard)

  Creates a editor-snip% with either a sub-editor from text% or sub-pasteboard from pasteboard%, depending on whether type is 'text or 'pasteboard. The keymap (see keymap%) and style list (see style-list%) for of the new sub-editor are set to the keymap and style list of this editor.