https://lxr.kde.org/source/plasma/kwin/src/x11eventfilter.cpp?v=stable-kf6-qt6
/stable-kf6-qt6/plasma/kwin/src/x11eventfilter.cpp
KDE Source Cross Reference
stableplasmakwinsrccpp
https://lxr.kde.org/source/plasma/kwin/src/x11eventfilter.h?v=stable-kf6-qt6
/stable-kf6-qt6/plasma/kwin/src/x11eventfilter.h
KDE Source Cross Reference
stableplasmakwinsrch