[PyQt] Changing color of individual tabs

[kristof.mulier at telenet.be]

Dear PyQt5 users/developers, 

I've been struggeling with the following problem: I can't change the color of an individual tab (from a QTabWidget) without losing its stylesheet or burning up my CPU. I've posted the question some weeks ago on StackOverflow - but couldn't get a meaningful answer either. 
Please take a look at the question, and win the +50 bonus points if you can help me out: 

[ https://stackoverflow.com/questions/49464153/giving-a-color-to-single-tab-consumes-too-much-processing-power-pyqt5-python-3 | https://stackoverflow.com/questions/49464153/giving-a-color-to-single-tab-consumes-too-much-processing-power-pyqt5-python-3 ] 

Thank you so much. 

Kind greetings, 

Kristof Mulier 
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