[@nativescript/datetimepicker] DateTimePicker resets date if set first after setting time

I'm using the DateTimePicker component in my application and found a potential bug.

• Setting time field first, it auto sets the date field on the current date. Updating the date field works.
• Setting date field first, it sets the date field and leaves time blank. Setting the time field now, RESETS date field to current day.

There is a property called autoPickTime which defaults to false. I guess thats the reason why setting date does not set the time.

It would be nice to have similar property autoPickDate to prevent overwritting the date or at least check for a set date.

@nativescript/datetimepicker コンポーネントから始め、issue で説明されている両方のフィールド設定シーケンスを再現します。既存の autoPickTime の動作を確認し、時刻より前に日付を設定しても、選択した日付が現在の日付に置き換えられなくなっていることを検証します。この動作は適切な回帰テストでカバーする必要があります。