Created attachment 59077 [details] "Skeleton" test window decoration that should enable blur behind Version: unspecified (using Devel) OS: Linux Since KDE 4.6.x blur effect does not work behind a KCommonDecoration, even if it is transparent and sets the "AbilityUsesBlurBehind" property. Reproducible: Always Steps to Reproduce: Install the attached test decoration Actual Results: No blur behind decoration, even when blur effect is enabled (and works behind Plasma panels) Expected Results: Blur works This affects deKorator and Smaragd theming engines.
The decoration has also to support the AbilityUsesAlphaChannel to get blur behind the decoration. I just added it to the source code and everything get's nicely blurred.