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未使用メンバ変数削除 (m_bVisualStyle) #2043
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「この変数が要らない」わけではなく、本来なら参照すべき箇所(≒OnDrawItem内、2か所)で
「::IsVisualStyle()」を直接呼び出しているために「現状は使われていない」が実情のようです。
あるべき論を語り出すとめんどくさいですが、「テーマ(≒旧称VisualStyle)が有効かどうか」というグローバル状態をウインドウのメッセージディスパッチャクラスのプロパティにキャッシュさせるやり方は、それなりに一般的で妥当な気がします。
「CTabWndクラスが複数ウインドウのメッセージを処理していてメンバー変数もイベントハンドラも多過ぎ、構造が分かりづら過ぎ」というのには同意しますが、このメンバーを削ることで「分かりやすくなるか?」というと微妙に思っています。(実際、変数が保持する情報を使うコードがありますし。)