def METHOD_NAME(self, filename: str) -> bool:
    """
    Checks if the given file has duplicate shortcut keys.
    """
    with open(filename, "r", encoding = "utf-8") as f:
        all_lines = f.readlines()
    all_lines = [l.strip() for l in all_lines]
    shortcut_dict = collections.defaultdict(dict)
    found_ctxt = False
    current_data = dict()
    current_field = None
    start_line = None
    for idx, line in enumerate(all_lines):
        if line.startswith(self.MSGCTXT):
            found_ctxt = True
            current_data.clear()
            current_field = self.MSGCTXT
            current_data[current_field] = self._fetch_data(line)
            start_line = idx
            continue
        elif found_ctxt and line.startswith(self.MSGID):
            current_field = self.MSGID
            current_data[current_field] = self._fetch_data(line)
            continue
        elif found_ctxt and line.startswith(self.MSGSTR):
            current_field = self.MSGSTR
            current_data[current_field] = self._fetch_data(line)
            continue
        elif found_ctxt and line.startswith('"'):
            data = line[1:-1]  # strip the beginning and ending double-quotes
            current_data[current_field] += data
            continue
        if current_data:
            self._process_translation(shortcut_dict, current_data, start_line)
        current_data.clear()
        current_field = None
        found_ctxt = False
        start_line = None
    return self._show_all_duplicates(shortcut_dict, filename)