kvermette added a comment.
My only concern is that many windows with the Breeze style have very little colour, some (like Kate) might not see the effect be distinguishable at all. Should we perhaps consider using an overlay colour selected from the colour scheme which we know will stand out? E.g. Tint the window contents the "Negative" (usually red) colour? REPOSITORY R108 KWin REVISION DETAIL https://phabricator.kde.org/D5245 To: broulik, #plasma, #kwin, #vdg, graesslin Cc: kvermette, graesslin, plasma-devel, kwin, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol