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このpull requestが解決する内容
一部のパターンでmainWindowが画面外領域に出ることを判定できなかった問題を修正します。
たとえばマルチディスプレイかつディスプレイの付け外しを行う環境で、画面外の座標が保存されてしまい、そのまま操作できなくなる場合がありました。
#94 (review) に関係していると見えて、完全には解消していない可能性が否定できませんが、効果ありと見て変更します。
動作確認手順