Update search letters with text input in search box.

def update_search_letters(self, text):
        """Update search letters with text input in search box."""
        self.letters = text
        names = [shortcut.name for shortcut in self.shortcuts]
        results = get_search_scores(text, names, template='<b>{0}</b>')
        self.normal_text, self.rich_text, self.scores = zip(*results)
        self.reset()