https://lxr.kde.org/source/plasma/kwin/src/backends/x11/standalone/x11_standalone_windowselector.cpp?v=stable-kf5-qt5
/stable-kf5-qt5/plasma/kwin/src/backends/x11/standalone/x11_standalone_windowselector.cpp
KDE Source Cross Reference
stableplasmakwin
https://lxr.kde.org/source/plasma/kwin/src/backends/x11/standalone/x11_standalone_windowselector.h?v=kf5-qt5
/kf5-qt5/plasma/kwin/src/backends/x11/standalone/x11_standalone_windowselector.h
KDE Source Cross Reference
plasmakwinsrcbackendsstandalone