All KDE applications used icons for tray from plasma theme. But KRFB not... it's spoil style with monochrome icons on tray. After add file krfb.svg on plasma theme with ID's: - krfb - 22-22-krfb KRFB used system icon from system icon theme, but not from plasma theme. https://github.com/PapirusDevelopmentTeam/adapta-kde/issues/73
Created attachment 114362 [details] preview bug
The problem is that krfb sets a custom pixmap icon: setIconByPixmap(QIcon::fromTheme("krfb").pixmap(22, 22, QIcon::Disabled)); So it can be "disabled" or "enabled" depending on whether there is a client connected or not. Moreover, QIcon::fromTheme uses the application icon theme instead of Plasma's.