class ResizingQLineEdit(QLineEdit):
    '''A QLineEdit whose sizeHint matches the text width'''
    def __init__(self, *args, **kwargs) -> None:
        super().__init__(*args, **kwargs)
        self.textChanged.connect(self.updateGeometry)

    def sizeHint(self) -> QtCore.QSize:
        hint = super().sizeHint()
        hint.setWidth(self.fontMetrics().width(self.text()))
        return hint