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I just tested running gtk3-demo and gtk4-demo in sway. gtk4-demo does draw its shadows on other windows, but I wouldn't have noticed that if you hadn't brought it to my attention. Each has only the GTK title bar (no sway title bar) in both floating and tiled mode (but not full screen), which is, imo, a reasonable way for things to work.

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Not sure how you’re getting no Sway title bar out of it. In fact, when I run `swaymsg border csd` with the tiled gtk4-demo focused, I get “This window doesn't support client side decorations” and I have no idea what’s up with that, especially given that the window definitely gets border csd when floating. ¯\_(ツ)_/¯

It’s possible it’s related to more recent changes in Sway. I haven’t updated Sway since March (since I’ve been using the high-DPI XWayland patches and updating is comparatively bothersome). I dunno.

Incidentally, I mostly use tabbed layout, and you’re always going to get server-side decorations out of that, since you’re breaking out of the rectangles mould.

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