<Activity> – React

When an Activity boundary is hidden, React will visually hide its children using the display: "none" CSS property. It will also destroy their Effects, cleaning up any active subscriptions. While hidden, children still re-render in response to new props, albeit at a lower priority than the rest of the content. When the boundary becomes visible again, React will reveal the children with their previo

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`<Activity>`はmode=hiddenでdisplay:noneによる非表示+エフェクトを破棄するが、Stateを維持される。 タブ切り替えのような状態を維持して表示を切り替えるパターンや、イベントは実行しないけと初期レンダリングには含めたいケー