def METHOD_NAME(self):
    """Divide the focus edit widget at the cursor location."""
    focus = self.lines[self.focus]
    pos = focus.edit_pos
    edit = urwid.Edit("",focus.edit_text[pos:], allow_tab=True)
    edit.original_text = ""
    focus.set_edit_text(focus.edit_text[:pos])
    edit.set_edit_pos(0)
    self.lines.insert(self.focus+1, edit)