Still testing this one: a window rule to set the xdg-toplevel Tiled state.
By default niri matches it to prefer-no-csd, because the Tiled state currently happens to be the best way to ask always-CSD windows to square their corners.
With this tiled-state window rule you can override it, for example to get title bars (for easy mouse-only gestures) together with square corners (if you're going for a square style with borders, like mine here). You can also e.g. limit it to tiled windows.
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