Right now if a theme wants round corners it has to make them transparent, which looks weird when blur is enabled. If there was a way to make corners round without using the default transparency method it would look much nicer and not be affected by the blur.
Of panels and the plasma popups?
(In reply to David Edmundson from comment #1) > Of panels and the plasma popups? Mainly on window borders but those too.
*changing back to reported*
We won't support that.
(In reply to David Edmundson from comment #4) > We won't support that. I understand, however it does make Qt5 applications look really ugly where every other application and part of plasma looks clean Image: https://imagebin.ca/v/5GZDui0TyT0N
This is a real issue that is very widespread. Some effort needs to be put into fixing this as it’s been reported over and over again for at least 3 years.
We've had this bug and discussions on how to resolve it or workaround it for a few years now: https://bugs.kde.org/show_bug.cgi?id=395725
*** This bug has been marked as a duplicate of bug 395725 ***