Other in Graphics
In addition to KDirWatch (inotify, fam) use the org.kde.KDirNotify DBus interface to collect information about file changes.
With this we are guaranteed to be informed about all actions carried out by KDE ioslave, but nothing outside KDE.
KDirWatch is in place to handle all remaining stuff, but it fails on some systems. I hope that KDirNotify will have a higher reliability in its smaller scope.