Refresh widget

def refresh_plugin(self):
        """Refresh widget"""
        curdir = getcwd_or_home()
        self.pathedit.add_text(curdir)
        self.save_wdhistory()
        self.set_previous_enabled.emit(
                             self.histindex is not None and self.histindex > 0)
        self.set_next_enabled.emit(self.histindex is not None and \
                                   self.histindex < len(self.history)-1)