[PyQt] QSystemTrayIcon not hide when quit program

[Flya Flyaa]

I found when exit the program, the system tray icon is still here.

I tried example code in folder PyQt-gpl-5.4.1\examples\desktop\systray, it
also has this problem.

My system is windows xp 32 bit, python 2.7 with code PyQt-gpl-5.4.1.
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