How to get blurred windows on Plasma 6?

How to get blurred windows in Plasma 6? With Kvantum not being an option, is there another means to achieve the same effect? I also use Flatpak apps.

You don’t need kvantum really. I’ve used lightly for a long time and adapted some color schemes to get completely transparent and blurred windows. But I’m afraid that, along with a heap of other things, lightly will be no option. Unless it will be ported of course.

If this theme Alpha - KDE Store blurred properly, then it would be perfect.

You might be waiting for some time. I have been trying to port my Klassy window decoration (which has an optional blur effect in the included Application Style) to Plasma 6, and think I have found a bug in Plasma6 whereby if you specify a blur region in the Application Style then the region is not blurred at the correct position:

https://bugs.kde.org/show_bug.cgi?id=482294

The author of Lightly has disappeared but others are trying to port it to Plasma 6
here: Add support for plasma 6 · Issue #13 · boehs/Lightly · GitHub

I see. Myeah, plasma 6…Fingers crossed I guess. Me personally I can’t use it for a ton of reasons. But um…that kvantum alpha theme, for example, didn’t require
kvantum at all. You could do that with lightly and some tweaks in the color scheme. I posted a few screenshots of entirely transparent themes in “share your desktop”, no kvantum required. As for breeze application style, I’m not even sure it supports transparency settings these days.
edit: I checked. Nah it doesn’t.

With nouveau driver on old Nvidia card, 6.0.5. on Manjaro,

I have experimented with this github install and found it working for window contents and decoration (each window or window class has to have manually added opacity rules, for active/inactive windows, in %).

It will show up in Desktop Effects as Force Blur.

-Untick the ~“add opacity” (or similar) in the first tab of its settings.

-In the other tabs select, apply to all except (above classes)

-Untick blur panel, menu, ~“fix something”, and all things except window (decoration).

-Temporarily disable the default install Desktop Effects: Translucency, Blur, Background Contrast, Slide Back, Magic Lamp.

  • reboot once or twice even with logins
    -then see if its working with a window that you gave an opacity rule.

Now you add the other desired effects that you disabled back and see it continuously working, after a logout/-in.

I’m not on my laptop right now but can make screen shots [of the above vaguely decribed] settings if desired!

What is shocking that the default Breeze application style allows for context menus to be transparent and blurred. But not the windows themselves… So odd.