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掲題どおり。
ある種の環境でペンタブレットでゲーム画面をドラッグした際、ブラウザウィンドウ全体のスクロールなど (いわゆる direct manipulation) が起きるのを抑止します。これは akashic serve などでは再現しませんが、ドラッグを使うサンプルデモ で以下の条件で確認できます。
ただし上のデモは pdi-browser を使っておらず、この PR 自体では修正されません。(ブラウザの開発者ツールで、この PR と同じように
touch-action
をつけて問題を解消することを目視しています)akashic serve に組み込み、以下の環境で意図しない影響が出ないことを確認しています。