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Allow entry in QLineEdit only within range of QDoubleValidator

That's because QDoubleValidator returns QValidator::Intermediate if the value is outside the bounds and QLineEdit accepts ...

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查詢 「QDoubleValidator」的人也找了：

  1. QLineEdit
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  2. QDoubleValidator
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  3. QIntValidator
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  4. setValidator
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  5. QValidator
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  6. Pyqt input mask
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  7. QLineEdit number only
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  8. Qlineedit float only
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