https://bugs.kde.org/show_bug.cgi?id=377162

--- Comment #54 from ✨ Audrey ✨ <[email protected]> ---
It wasn't disabled. It's not supported by the wayland protocol, which delegates
control of a window to the client. There is an open MR, but it seems that it
hasn't been worked in about 3 years:
https://invent.kde.org/plasma/kwin/-/merge_requests/1183

Even to get that MR ready would take a lot of work, and there's no clear
benefit. Firstly, shading would require a protocol extension to communicate
window state to client applications to avoid unnecessary client reflow. Second,
it would introduce even more complexity to the boxes KWin needs to track
per-window. Third, it would only work when you're running on the KWin
compositor, since Mutter/etc don't have plans to implement it. Forth, it would
only work with KDE applications. 

To sum up, there's a substantial amount of downstream complexity that this
would introduce. It's not clear to the current KWin maintainer that
implementing the feature is worth that complexity. They're the one that would
be fielding bugs for all of the edge-cases that don't work.

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