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Openai/69509ae0-53e8-8004-aaaa-2f999c8dda20
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==== 2) 「Excelというアプリの性質」上、SDIでも残りがちなタイプ ==== * セル編集中に他操作を強く抑止する これはMDI/SDIというより「セル編集中=未確定の式・参照選択・IME絡み」という“特殊モード”をどう扱うかの問題で、どのみち制約は出やすい。 * コピーが特定操作で消える(Cut/Copyモードの解除) これもExcel特有の「範囲コピー=単なるクリップボード以上のモード」なので、SDIでも“変な消え方”自体は残った可能性が高い(ただ、別ブック・別ウィンドウへの波及範囲はもっと限定できたかもしれない)。 * 同じ名前のブックを開けない これは内部識別や参照解決、VBA/アドイン/自動化(COM)的な“ブックを名前で掴む文化”まで絡むので、SDI起源でも「インスタンス内一意」制約は残り得る。 (ただし、設計の自由度は増えるので、別名表示や内部IDで逃がす余地はあったはず。)
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