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KDE application themes not available in Qt5
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It seems that Qt5 (5.15.2) is not aware of the KDE application themes.
QStyleFactory::keys()returns("Windows", "Fusion"). I read something about Qt not using themes if not installed globally, so I installed it as root, but the issue remained. -
Hi and welcome to devnet,
The most simple in this case is to use your distribution provided Qt.