On kwin window rules kcm, there is an option to block compositing for a window. It is translated "Composição por blocos" that giving the sense of lego blocks not a road block, so the correct translation would be "Bloquear composição" or "Bloquear compositor" Reproducible: Always
Fixed. kf5trunk: https://websvn.kde.org/?view=revision&revision=1456324 kf5stable: https://websvn.kde.org/?view=revision&revision=1456326 Thanks.