Hi!
I'm developing a KWin effect that rounds window corners. In order to get rid of the blur under rounded corners previously I used:

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w->setData(WindowBlurBehindRole, blur_region);

But in Plasma 5.27 WindowBlurBehindRole is going to be removed. So I tried to use:

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KWindowEffects::enableBlurBehind(w->windowId(), true, blur_region);

This works on X11, but I can't get windowId on Wayland. Is there a way to set window blur region from an effect on Wayland?