Currently when a blurred surface fades out, it's content fades out before the blur effect which results in a fully transparent empty and blurred rectangle fading out afterwards. This makes blur feel disconnected from the actual surface that it was attached to which is not optimal. What is the possibility of fixing this essentially fading out both content and effect(s) at relatively the same time?
This bug was reported against an outdated version of KWin. We have made many changes since the. If the issue persists in newer versions can you reopen the bug report updating the version number.