For the following KCM :
* KWin Options
* KWin Screen Edges
* KWin Tabbox
KCModule introduce an indicator to show which settings have changed from
default value. Unfortunately some KCM have settings' states which are not managed
automatically by the KCModule thus we have to handle it manually.
see https://invent.kde.org/frameworks/kconfigwidgets/-/merge_requests/9