Bug 477481

Created attachment 163437 [details]
left is CE on; right is CE off; notice difference at bottom of window

SUMMARY

Aurorae window decorations can blur an area under decoration. In comparison to other sources, such as the panel or behind (translucent) windows, it does not appear that the contrast effect settings can be applied to the region behind the window decoration. As a result, decorations have an inconsistent look if they are supposed to seamlessly blend with the window under the contrast effect. Attached is a view of an example theme with the CE on and the CE off.


STEPS TO REPRODUCE
1. Choose an application style with support for a translucent background. (I used Kvantum with Summaculate, https://store.kde.org/p/2105120/)
2. Choose a window decoration that should match with the window. (I used Sumac Blur, https://store.kde.org/p/2105128)
3. Enable the contrast effect if it isn't checked (System Settings: Workspace Behavior > Desktop Effects > Background Contrast)

OBSERVED RESULT
Window decoration remains the same

EXPECTED RESULT
Visual change to window decoration appearance to match window

SOFTWARE/OS VERSIONS
KDE Plasma Version:  5.27.9
KDE Frameworks Version: 5.111.0
Qt Version: 5.15.11

ADDITIONAL INFORMATION
Upon further consideration, I've realized that this functionality is completely out of scope for KDE. Aurorae has never supported controlling the contrast effect and that is accessible purely because Kvantum exposes it. Only the Plasma theme has control over it, to my knowledge.