Blur configurability isn't ideal
Right now we have 3 full-screen KWin effects with different background visuals and options:
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Overview: blur by default, but optional
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Window View: mandatory blur, no option In addition, the lock and login screens also both have mandatory blur with no option to disable it.
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Desktop Grid: no blur, no option
Finally, the logout screen has blur that respects the enablement status of the "Blur" Desktop Effect in System Settings. But disabling it has no impact on any of the other above-mentioned full-screen effects!
This patchwork doesn't seem ideal.
Maybe it makes sense to have blur in all these effects be optional, and control it by whether or not the global Blur effect is enabled or disabled, just like the logout screen already does. Then people who don't like blur get to turn it off everywhere.