Some of these could be cherry-picked. I haven't marked them yet, so feel free to let me know which ones you want to see on stable.
- effects: Fix stacking order of windows relative to panels
- effects: Fix initial hidden state: also initially hide windows from other desktops
- effects/private: Rename property 'hidden' to 'activeHidden'
- effects/private: Simplify "active-hidden" state by inheriting from "initial-hidden"
- effects: Fix windows visibility during partial activation (realtime gesture)