Demo Qt 5.8 stylesheet tilde problem

pyqt58style.py

"""
Qt >= 5.8 stops parsing stylesheet when it sees ~=,
button text is underlined but not italic, and doesn't change when clicked

PyQt < 5.8 works as expected, button text is underlined and italic,
and becomes large and red when clicked
"""

import sys
from PyQt5 import QtWidgets

SHEET = """
QPushButton {text-decoration: underline;}
QWidget[style_class ~= 'large'] {font-size: 48px;}
QWidget[style_class ~= 'urgent'] {color: red;}
QPushButton {font-style: italic;}
"""

def main():
    
    app = QtWidgets.QApplication(sys.argv)
    
    window = QtWidgets.QMainWindow()
    window.setStyleSheet(SHEET)
    
    button = QtWidgets.QPushButton("Button")
    
    def callback(clicked, button=button):
        button.setProperty('style_class', 'urgent active large etc')
        button.setStyleSheet("/* */")  # force update of widget styling

    button.clicked.connect(callback)
    
    window.setCentralWidget(button)
    window.show()
    app.exec_()

if __name__ == '__main__':
    main()