В письме от среда, 1 апреля 2020 г. 15:10:50 MSK пользователь mcpain@basealt.ru написал:
Also reproducible on: Fedora 29 (MATE) Ubuntu 19.10 (MATE)
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When QCoreApplicationPrivate::maybeQuit() is called, quitLockRef.load() == 0, hence QEvent::Quit is sent on MATE and application terminates. KDE is fine because there is plasma-integration package, which provides KDEPlatformSystemTrayIcon and quitLockRef.load() != 0 when maybeQuit() is called.
Took a look at other Qt5 applications like Psi+ and made a patch with similar workaround.