1. 问题：显示2组相同的成交单

发生条件：登录vnpy后，运行策略，连续2天没有重新启动。

description

2. 解决方法：

修改vnpy\trader\ui\widget.py中的TradeMonitor：

class TradeMonitor(BaseMonitor):
    """
    Monitor for trade data.
    """

    event_type = EVENT_TRADE
    data_key = "tradeid"    # hxxjava chanage
    sorting = True

    headers: Dict[str, dict] = {
        "tradeid": {"display": "成交号 ", "cell": BaseCell, "update": False},
        "orderid": {"display": "委托号", "cell": BaseCell, "update": False},
        "symbol": {"display": "代码", "cell": BaseCell, "update": False},
        "exchange": {"display": "交易所", "cell": EnumCell, "update": False},
        "direction": {"display": "方向", "cell": DirectionCell, "update": False},
        "offset": {"display": "开平", "cell": EnumCell, "update": False},
        "price": {"display": "价格", "cell": BaseCell, "update": False},
        "volume": {"display": "数量", "cell": BaseCell, "update": False},
        "datetime": {"display": "时间", "cell": TimeCell, "update": False},
        "gateway_name": {"display": "接口", "cell": BaseCell, "update": False},
    }